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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2009	Jan. 29, 2010	Jun. 30, 2009
Document and Entity Information Abstract
Document type	10-K
Document period end date	Dec. 31, 2009
Amendment flag	false
Entity registrant name	UNION PACIFIC CORPORATION
Entity central index key	0000100885
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well known seasoned issuer	Yes
Entity common stock shares outstanding		505,286,368
Entity public float			$ 28,701

Consolidated Statements of Income - USD ($) shares in Millions	12 Months Ended
Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Operating revenues:
Freight revenues	$ 13,373,000,000	$ 17,118,000,000	$ 15,486,000,000
Other revenues	770,000,000	852,000,000	797,000,000
Total operating revenues	14,143,000,000	17,970,000,000	16,283,000,000
Operating expenses:
Compensation and benefits	4,063,000,000	4,457,000,000	4,526,000,000
Fuel	1,763,000,000	3,983,000,000	3,104,000,000
Purchased services and materials	1,614,000,000	1,902,000,000	1,856,000,000
Depreciation	1,444,000,000	1,387,000,000	1,321,000,000
Equipment and other rents	1,180,000,000	1,326,000,000	1,368,000,000
Other	687,000,000	840,000,000	733,000,000
Total operating expenses	10,751,000,000	13,895,000,000	12,908,000,000
Operating income	3,392,000,000	4,075,000,000	3,375,000,000
Other income (Note 6)	195,000,000	92,000,000	116,000,000
Interest expense	(600,000,000)	(511,000,000)	(482,000,000)
Income before income taxes	2,987,000,000	3,656,000,000	3,009,000,000
Income taxes (Note 7)	(1,089,000,000)	(1,318,000,000)	(1,154,000,000)
Net income	1,898,000,000	2,338,000,000	1,855,000,000
Share and Per Share (Notes 8):
Earnings per share - basic	3.77	4.58	3.49
Earnings per share - diluted	$ 3.75	$ 4.54	$ 3.46
Weighted average number of shares - basic	503.0	510.6	531.9
Weighted average number of shares - diluted	505.8	515.0	536.8
Dividends declared per share	$ 1.08	$ 0.98	$ 0.745

Nature Of Operations

12 Months Ended

Dec. 31, 2009

For purposes of this report, unless the context otherwise requires, all references herein to the “Corporation”, “UPC”, “we”, “us”, and “our” mean Union Pacific Corporation and its subsidiaries, including Union Pacific Railroad Company, which will be separately referred to herein as “UPRR” or the “Railroad”.

1. Nature of Operations

Operations and Segmentation – We are a Class I railroad that operates in the United States. We have 32,094 route miles, linking Pacific Coast and Gulf Coast ports with the Midwest and eastern United States gateways and providing several corridors to key Mexican gateways. We serve the western two-thirds of the country and maintain coordinated schedules with other rail carriers for the handling of freight to and from the Atlantic Coast, the Pacific Coast, the Southeast, the Southwest, Canada, and Mexico. Export and import traffic is moved through Gulf Coast and Pacific Coast ports and across the Mexican and Canadian borders.

The Railroad, along with its subsidiaries and rail affiliates, is our one reportable operating segment. Although revenues are analyzed by commodity group, we analyze the net financial results of the Railroad as one segment due to the integrated nature of our rail network. The following table provides revenue by commodity group:

Millions of Dollars

lt;/i/tdtd height="28" style="border-top: 2px solid #000000;border-bottom: 1px solid #000000;" align="right" width="61"bi2009#160;/i/b/tdtd height="28" style="border-top: 2px solid #000000;border-bottom: 1px solid #000000;" align="right" width="19"bi#160;/i/b/tdtd height="28" style="border-top: 2px solid #000000;border-bottom: 1px solid #000000;" align="right" width="61"i2008#160;/i/tdtd height="28" style="border-top: 2px solid #000000;border-bottom: 1px solid #000000;" align="right" width="19"i#160;/i/tdtd height="28" style="border-top: 2px solid #000000;border-bottom: 1px solid #000000;" align="right" width="61"i2007#160;/i/td/trtrtd height="20" style="border-top: 1px solid #000000;" align="left" width="385"#160;Agricultural /tdtd height="20 " style="border-top: 1px solid #000000;" align="right" width="19"b$/b/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61"b 2,666#160;/b/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="19"$/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61" 3,174#160;/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="19"$/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61" 2,605#160;/td/trtrtd height="20" width="385" align="left"#160;Automotive /tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right"b 854#160;/b/tdtd height="20" width="19" align="right"b#160;/b/td td height="20" width="61" align="right" 1,344#160;/tdtd height="20" width="19" align="right"#160;/tdtd height="20" width="61" align="right" 1,458#160;/td/trtrtd height="20" width="385" align="left"#160;Chemicals /tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right"b 2,102#160;/b/tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right" 2,494#160;/tdtd height="20" width="19" align="right"#160;/tdtd height="20" width="61" align="right" 2,287#160;/td/trtrtd height="20" width="385" align="left"#160;Energy /tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right" ;b 3,118#160;/b/tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right" 3,810#160;/tdtd height="20" width="19" align="right"#160;/tdtd height="20" width="61" align="right" 3,134#160;/td/trtrtd height="20" width="385" align="left"#160;Industrial Products /tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right"b 2,147#160;/b/tdtd height="20" width="19" align="right"b#160;/b/tdtd height="20" width="61" align="right" 3,273#160;/tdtd height="20" width="19" align="right"#160;/tdtd height="20" width="61" align="right" 3,077#160;/td/trtrtd height="20" style="border-bottom: 1px solid #000000;" align="left" width="385"#160;Intermodal /tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="19"b#160;/b/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61"b 2,486#160;/b/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="19"b#160;/b/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61" 3,023#160;/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="19"#160;/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61" 2,925#160;/td/trtrtd height="20" style="border-top: 1px solid #000000;" align="left" width="385"#160;Total freight revenues /tdtd height="20" style="border-top: 1px solid #000000;" align="right" widt h="19"b$/b/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61"b 13,373#160;/b/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="19"$/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61" 17,118#160;/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="19"$/tdtd height="20" style="border-top: 1px solid #000000;" align="right" width="61" 15,486#160;/td/trtrtd height="20" style="border-bottom: 1px solid #000000;" align="left" width="385"#160;Other revenues /tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="19"b#160;/b/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61"b 770#160;/b/tdtd height="20 " style="border-bottom: 1px solid #000000;" align="right" width="19"b#160;/b/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61" 852#160;/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="19"#160;/tdtd height="20" style="border-bottom: 1px solid #000000;" align="right" width="61" 797#160;/td/trtrtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="left" width="385"#160;Total operating revenues /tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="19"b$/b/tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="61"b 14,143#160;/b/tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="19"$/tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="61" 17,970#160;/tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="19"$/tdtd height="28" style="border-top: 1px solid #000000;border-bottom: 2px solid #000000;" align="right" width="61" 16,283#160;/td/tr/tablepAlthough our revenues are principally derived from customers domiciled in the United States, the ultimate points of origination or destination for some products transported are outside the United States.br /br /Basis of Presentation #8211; The Consolidated Financial Statements are presented in accordance with accounting principles generally accepted in the United States of America (GAAP) as codified in the Financial Accounting Standards Board (FASB) Accounting Standards Codifica tion (ASC).br /br /Subsequent Events Evaluation #8211; We evaluated the effects of all subsequent events through February 5, 2010, the date of this report, which is concurrent with the date we file this report with the U.S. Securities and Exchange Commission (SEC).br //p/div

Consolidated Statements of Financial Position - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2008
Current assets:
Cash and cash equivalents	$ 1,850	$ 1,249
Accounts receivable	666	594
Materials and supplies	475	450
Current deferred income taxes (Note 7)	339	276
Other current assets	350	244
Total current assets	3,680	2,813
Investments	1,036	974
Net properties (Note 10)	37,428	35,701
Other assets	266	234
Total assets	42,410	39,722
Current liabilities:
Accounts payable and other current liabilities (Note 11)	2,470	2,560
Debt due within one year (Note 13)	212	320
Total current liabilities	2,682	2,880
Debt due after one year (Note 13)	9,636	8,607
Deferred income taxes (Note 7)	11,130	10,282
Other long-term liabilities	$ 2,021	2,506
Commitments and contingencies (Note 15)
Total liabilities	$ 25,469	24,275
Common shareholders' equity (Note 3):
Common shares, $2.50 par value, 800,000,000 authorized; 553,497,981 and 552,775,812 issued; 505,039,952 and 503,225,705 outstanding, respectively	1,384	1,382
Paid-in-surplus	3,968	3,949
Retained earnings	15,167	13,813
Treasury stock	(2,924)	(2,993)
Accumulated other comprehensive loss (Note 9)	(654)	(704)
Total common shareholders' equity	16,941	15,447
Total liabilities and common shareholders' equity	$ 42,410	$ 39,722

Consolidated Statements of Financial Position (Parentheticals) - USD ($)	Dec. 31, 2009	Dec. 31, 2008
Consolidated Statements of Financial Position Parentheticals Abstract
Common shares, par value	$ 2.50	$ 2.50
Common shares authorized	800,000,000	800,000,000
Common shares issued	553,497,981	552,775,812
Common shares outstanding	505,039,952	503,225,705

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Operating Activities
Net income	$ 1,898	$ 2,338	$ 1,855
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	1,444	1,387	1,321
Deferred income taxes and unrecognized tax benefits	723	547	332
Net gain on non-operating asset dispositions	(162)	(41)	(52)
Other operating activities, net	(376)	89	(207)
Changes in Current Assets and Liabilities
Accounts receivable, net.	(72)	38	47
Materials and supplies.	(25)	3	(58)
Other current assets.	(106)	51	(104)
Accounts payable and other current liabilities	(90)	(342)	143
Cash provided by operating activities	3,234	4,070	3,277
Investing Activities
Capital investments	(2,384)	(2,780)	(2,496)
Proceeds from asset sales	187	93	122
Acquisition of equipment pending financing	(100)	(388)	(621)
Proceeds from sale of assets financed	100	388	621
Other investing activities, net	22	(77)	(52)
Cash used in investing activities	(2,175)	(2,764)	(2,426)
Financing Activities
Debt issued	843	2,257	1,581
Common share repurchases (Note 16)	0	(1,609)	(1,375)
Debt repaid	(871)	(1,208)	(792)
Dividends paid	(544)	(481)	(364)
Other financing activities, net	114	106	150
Cash used in financing activities	(458)	(935)	(800)
Net change in cash and cash equivalents	601	371	51
Cash and cash equivalents at beginning of year	1,249	878	827
Cash and cash equivalents at end of year	1,850	1,249	878
Supplemental Cash Flow Information
Capital lease financings	842	175	82
Cash dividends declared but not yet paid	132	132	112
Capital investments accrued but not yet paid	96	93	126
Settlement of current liabilities for debt	14	0	0
Common shares repurchased but not yet paid	0	0	82
Cash paid during the year for:
Interest, net of amounts capitalized	(578)	(500)	(467)
Income taxes, net of refunds	$ (452)	$ (699)	$ (839)

Consolidated Statements of Changes in Common Shareholders' Equity - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	$ 15,447	$ 15,585	$ 15,312
Comprehensive income:
Net income	1,898	2,338	1,855
Other comp. income/(loss)	50	(630)	68
Total comp. income (Note 9)	1,948	1,708	1,923
Cumulative effect of adoption of FIN 48			(7)
Conversion, stock option exercises, forfeitures, and other	90	182	210
Share repurchases (Note 16)	0	(1,527)	(1,457)
Cash dividends declared	(544)	(501)	(396)
Stockholders' equity (Note 3), ending balance	$ 16,941	$ 15,447	$ 15,585
Common Stock (units)
Statement [Line Items]
Common shares (Note 3), beginning balance	552.8	552.3	551.9
Comprehensive income:
Conversion, stock option exercises, forfeitures, and other (shares)	0.7	0.5	0.4
Share repurchases (shares) (Note 16)	0.0	0.0	0.0
Common shares (Note 3), ending balance	553.5	552.8	552.3
Treasury Stock (units)
Statement [Line Items]
Common shares (Note 3), beginning balance	(49.6)	(30.6)	(11.6)
Comprehensive income:
Conversion, stock option exercises, forfeitures, and other (shares)	1.1	3.2	6.2
Share repurchases (shares) (Note 16)	0.0	(22.2)	(25.2)
Common shares (Note 3), ending balance	(48.5)	(49.6)	(30.6)
Common Stock
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	$ 1,382	$ 1,381	$ 1,381
Comprehensive income:
Net income	0	0	0
Other comp. income/(loss)	0	0	0
Total comp. income (Note 9)	0	0	0
Cumulative effect of adoption of FIN 48			0
Conversion, stock option exercises, forfeitures, and other	2	1	0
Share repurchases (Note 16)	0	0	0
Cash dividends declared	0	0	0
Stockholders' equity (Note 3), ending balance	1,384	1,382	1,381
Paid-in-Surplus
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	3,949	3,926	3,943
Comprehensive income:
Net income	0	0	0
Other comp. income/(loss)	0	0	0
Total comp. income (Note 9)	0	0	0
Cumulative effect of adoption of FIN 48			0
Conversion, stock option exercises, forfeitures, and other	19	23	(17)
Share repurchases (Note 16)	0	0	0
Cash dividends declared	0	0	0
Stockholders' equity (Note 3), ending balance	3,968	3,949	3,926
Retained Earnings
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	13,813	11,976	10,524
Comprehensive income:
Net income	1,898	2,338	1,855
Other comp. income/(loss)	0	0	0
Total comp. income (Note 9)	1,898	2,338	1,855
Cumulative effect of adoption of FIN 48			(7)
Conversion, stock option exercises, forfeitures, and other	0	0	0
Share repurchases (Note 16)	0	0	0
Cash dividends declared	(544)	(501)	(396)
Stockholders' equity (Note 3), ending balance	15,167	13,813	11,976
Treasury Stock
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	(2,993)	(1,624)	(394)
Comprehensive income:
Net income	0	0	0
Other comp. income/(loss)	0	0	0
Total comp. income (Note 9)	0	0	0
Cumulative effect of adoption of FIN 48			0
Conversion, stock option exercises, forfeitures, and other	69	158	227
Share repurchases (Note 16)	0	(1,527)	(1,457)
Cash dividends declared	0	0	0
Stockholders' equity (Note 3), ending balance	(2,924)	(2,993)	(1,624)
Accumulated Other Comprehensive Loss (Note 9)
Statement [Line Items]
Stockholders' equity (Note 3), beginning balance	(704)	(74)	(142)
Comprehensive income:
Net income	0	0	0
Other comp. income/(loss)	50	(630)	68
Total comp. income (Note 9)	50	(630)	68
Cumulative effect of adoption of FIN 48			0
Conversion, stock option exercises, forfeitures, and other	0	0	0
Share repurchases (Note 16)	0	0	0
Cash dividends declared	0	0	0
Stockholders' equity (Note 3), ending balance	$ (654)	$ (704)	$ (74)