$UNP
UNION PACIFIC CORP Stock $unp

$unp Overview Financials Valuation SEC Filings Company Website

2011 Form 10-K Financial Statement

#000119312512038569 Filed on February 03, 2012

Income Statement

Concept	2011	2010 Q4	2010 Q3
Revenue	$19.56B	$4.410B	$4.408B
YoY Change	15.28%	17.47%	20.08%
Cost Of Revenue	$5.586B	$1.154B	$1.073B
YoY Change	29.25%	19.09%	22.07%
Gross Profit	$13.97B	$3.256B	$3.335B
YoY Change	10.5%	16.91%	19.45%
Gross Profit Margin	71.44%	73.83%	75.66%
Selling, General & Admin	$5.848B	$1.390B	$1.384B
YoY Change	7.18%	8.26%	7.37%
% of Gross Profit	41.86%	42.69%	41.5%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.617B	$380.0M	$372.0M
YoY Change	8.74%	1.88%	2.48%
% of Gross Profit	11.57%	11.67%	11.15%
Operating Expenses	$13.83B	$1.943B	$3.007B
YoY Change	15.43%	8.79%	10.96%
Operating Profit	$5.724B	$1.313B	$1.401B
YoY Change	14.92%	31.43%	45.79%
Interest Expense	$572.0M	-$141.0M	$153.0M
YoY Change	-4.98%	-7.84%	-1.92%
% of Operating Profit	9.99%	-10.74%	10.92%
Other Income/Expense, Net	$112.0M	-$2.000M	$25.00M
YoY Change	107.41%	100.0%	78.57%
Pretax Income	$5.264B	$1.180B	$1.273B
YoY Change	18.75%	35.79%	55.43%
Income Tax	$1.972B	$405.0M	$495.0M
% Of Pretax Income	37.46%	34.32%	38.88%
Net Earnings	$3.292B	$775.0M	$778.0M
YoY Change	18.42%	41.17%	51.36%
Net Earnings / Revenue	16.83%	17.57%	17.65%
Basic Earnings Per Share	$6.78	$1.58	$1.58
Diluted Earnings Per Share	$6.72	$1.56	$1.56
COMMON SHARES
Basic Shares Outstanding	485.7M shares	493.1M shares	493.0M shares
Diluted Shares Outstanding	489.8M shares		497.7M shares

Balance Sheet

Concept	2011	2010 Q4	2010 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.217B	$1.086B	$1.358B
YoY Change	12.06%	-41.3%	-5.37%
Cash & Equivalents	$1.217B	$1.086B	$1.358B
Short-Term Investments
Other Short-Term Assets	$495.0M	$367.0M	$394.0M
YoY Change	-21.18%	4.86%	48.12%
Inventory	$614.0M	$534.0M	$504.0M
Prepaid Expenses
Receivables	$1.401B	$1.184B	$1.297B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.727B	$3.432B	$3.910B
YoY Change	8.6%	-6.74%	21.54%
LONG-TERM ASSETS
Property, Plant & Equipment	$39.93B	$38.25B	$37.75B
YoY Change	4.39%	2.83%	1.69%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$1.175B	$1.137B	$1.104B
YoY Change	3.34%	9.75%	8.98%
Other Assets	$260.0M	$266.0M	$238.0M
YoY Change	-2.26%	0.0%	-29.38%
Total Long-Term Assets	$41.37B	$39.66B	$39.09B
YoY Change	4.32%	2.99%	1.61%
TOTAL ASSETS
Total Short-Term Assets	$3.727B	$3.432B	$3.910B
Total Long-Term Assets	$41.37B	$39.66B	$39.09B
Total Assets	$45.10B	$43.09B	$43.00B
YoY Change	4.66%	2.14%	3.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$819.0M	$677.0M	$634.0M
YoY Change	20.97%	10.62%	3.09%
Accrued Expenses	$809.0M	$882.0M	$689.0M
YoY Change	-8.28%	22.84%	-5.87%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$209.0M	$239.0M	$659.0M
YoY Change	-12.55%	12.74%	280.92%
Total Short-Term Liabilities	$3.317B	$2.952B	$3.185B
YoY Change	12.36%	10.07%	15.9%
LONG-TERM LIABILITIES
Long-Term Debt	$8.697B	$9.003B	$9.060B
YoY Change	-3.4%	-6.57%	-5.82%
Other Long-Term Liabilities	$2.136B	$1.813B	$1.840B
YoY Change	17.82%	-10.29%	-19.9%
Total Long-Term Liabilities	$10.83B	$1.813B	$1.840B
YoY Change	0.16%	-10.29%	-19.9%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.317B	$2.952B	$3.185B
Total Long-Term Liabilities	$10.83B	$1.813B	$1.840B
Total Liabilities	$26.52B	$25.33B	$25.57B
YoY Change	4.71%	-0.23%	1.21%
SHAREHOLDERS EQUITY
Retained Earnings		$17.15B	$16.57B
YoY Change		14.15%	12.3%
Common Stock		$1.385B	$1.385B
YoY Change		0.07%	0.07%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$4.027B	$3.850B
YoY Change		37.72%	30.33%
Treasury Stock Shares
Shareholders Equity	$18.58B	$17.76B	$17.44B
YoY Change
Total Liabilities & Shareholders Equity	$45.10B	$43.09B	$43.00B
YoY Change	4.66%	2.14%	3.15%

Cashflow Statement

Concept	2011	2010 Q4	2010 Q3
OPERATING ACTIVITIES
Net Income	$3.292B	$775.0M	$778.0M
YoY Change	18.42%	41.17%	51.36%
Depreciation, Depletion And Amortization	$1.617B	$380.0M	$372.0M
YoY Change	8.74%	1.88%	2.48%
Cash From Operating Activities	$5.873B	$1.385B	$1.025B
YoY Change	43.07%	37.81%	48.34%
INVESTING ACTIVITIES
Capital Expenditures	$3.176B	-$796.0M	-$630.0M
YoY Change	27.96%	45.79%	0.64%
Acquisitions
YoY Change
Other Investing Activities	$51.00M	-$19.00M	$25.00M
YoY Change	-30.14%	-115.97%	-46.81%
Cash From Investing Activities	-$3.119B	-$815.0M	-$605.0M
YoY Change	25.36%	90.87%	4.49%
FINANCING ACTIVITIES
Cash Dividend Paid	$837.0M
YoY Change	39.04%
Common Stock Issuance & Retirement, Net	$1.418B
YoY Change
Debt Paid & Issued, Net	$690.0M
YoY Change	-51.13%
Cash From Financing Activities	-$2.623B	-842.0M	-379.0M
YoY Change	10.16%	416.56%	13.81%
NET CHANGE
Cash From Operating Activities	$5.873B	1.385B	1.025B
Cash From Investing Activities	-$3.119B	-815.0M	-605.0M
Cash From Financing Activities	-$2.623B	-842.0M	-379.0M
Net Change In Cash	$131.0M	-272.0M	41.00M
YoY Change	-117.15%	-165.54%	-118.55%
FREE CASH FLOW
Cash From Operating Activities	$5.873B	$1.385B	$1.025B
Capital Expenditures	$3.176B	-$796.0M	-$630.0M
Free Cash Flow	$2.697B	$2.181B	$1.655B
YoY Change	66.17%	40.62%	25.66%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Entity Registrant Name EntityRegistrantName	UNION PACIFIC CORPORATION
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000100885
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	480067865	shares
CY2011Q2	dei	Entity Public Float EntityPublicFloat	50704000000	USD
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2009	us-gaap	Labor And Related Expense LaborAndRelatedExpense	4063000000	USD
CY2011	us-gaap	Fuel Costs FuelCosts	3581000000	USD
CY2010	us-gaap	Fuel Costs FuelCosts	2486000000	USD
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CY2010	unp	Equipment And Other Rents EquipmentAndOtherRents	1142000000	USD
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CY2009	us-gaap	Payments Of Dividends PaymentsOfDividends	544000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	108000000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	86000000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	114000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2623000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2381000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-458000000	USD
CY2010	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	98000000	USD
CY2011Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	284000000	USD
CY2010Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	183000000	USD
CY2009Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	132000000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	147000000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	125000000	USD
CY2009	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	0	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-178000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-80000000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2700000000	USD
CY2010	us-gaap	Dividends Cash DividendsCash	653000000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	17763000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-320000000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	131000000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-764000000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	601000000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1249000000	USD
CY2011	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	154000000	USD
CY2010	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
CY2009	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	842000000	USD
CY2009	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	96000000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	-572000000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	-614000000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	-578000000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-625000000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-936000000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-452000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	217000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	518000000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	72000000	USD
CY2011	unp	Increase Decrease In Material And Supplies IncreaseDecreaseInMaterialAndSupplies	80000000	USD
CY2010	unp	Increase Decrease In Material And Supplies IncreaseDecreaseInMaterialAndSupplies	59000000	USD
CY2009	unp	Increase Decrease In Material And Supplies IncreaseDecreaseInMaterialAndSupplies	25000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	395000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	243000000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-90000000	USD
CY2011	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2010	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2009	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	14000000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1850000000	USD
CY2011	unp	Deferred Income Taxes And Unrecognized Tax Benefits DeferredIncomeTaxesAndUnrecognizedTaxBenefits	986000000	USD
CY2010	unp	Deferred Income Taxes And Unrecognized Tax Benefits DeferredIncomeTaxesAndUnrecognizedTaxBenefits	672000000	USD
CY2009	unp	Deferred Income Taxes And Unrecognized Tax Benefits DeferredIncomeTaxesAndUnrecognizedTaxBenefits	718000000	USD
CY2011	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	272000000	USD
CY2010	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	17000000	USD
CY2009	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	106000000	USD
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.08
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.31
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.93
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	15315000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	50000000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1940000000	USD
CY2009	us-gaap	Dividends Cash DividendsCash	544000000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	16801000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2972000000	USD
CY2011	us-gaap	Dividends Cash DividendsCash	938000000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	18578000000	USD
CY2009	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	0	USD
CY2010	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1249000000	USD
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1418000000	USD
CY2009	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	90000000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	164000000	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	199000000	USD
CY2011	us-gaap	Nature Of Operations NatureOfOperations	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;margin-left:0px;">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”. </font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0px;">1. Nature of Operations</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0px;">Operations and Segmentation</font><font style="font-family:Arial;font-size:10pt;font-weight:bold;"> </font><font style="font-family:Arial;font-size:10pt;">– We are a Class I railroad that operates in the </font><font style="font-family:Arial;font-size:10pt;">U.S</font><font style="font-family:Arial;font-size:10pt;">. </font><font style="font-family:Arial;font-size:10pt;">Our network includes</font><font style="font-family:Arial;font-size:10pt;"> </font><font style="font-family:Arial;font-size:10pt;">31,</font><font style="font-family:Arial;font-size:10pt;">898</font><font style="font-family:Arial;font-size:10pt;"> </font><font style="font-family:Arial;font-size:10pt;">route miles, linking Pacific Coast and Gulf Coast ports with the Midwest and eastern </font><font style="font-family:Arial;font-size:10pt;">U.S.</font><font style="font-family:Arial;font-size:10pt;"> gateways and providing several corridors to key Mexican gateways. </font><font style="font-family:Arial;font-size:10pt;">We own 26,027 miles an</font><font style="font-family:Arial;font-size:10pt;">d</font><font style="font-family:Arial;font-size:10pt;"> operate on the remainder pursuant to trackage rights or leases. </font><font style="font-family:Arial;font-size:10pt;">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.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;margin-left:0px;">The Railroad, along with its subsidiaries and rail affiliates, is our one reportable opera</font><font style="font-family:Arial;font-size:10pt;">ting segment. Although revenue is </font><font style="font-family:Arial;font-size:10pt;">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. </font><font style="font-family:Arial;font-size:10pt;">The following table provides </font><font style="font-family:Arial;font-size:10pt;">freight </font><font style="font-family:Arial;font-size:10pt;">revenue by commodity group:</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 16px"><td style="width: 385px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:385px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: left;"> Millions</font></td><td style="width: 19px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">2011</font></td><td style="width: 19px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">2010</font></td><td style="width: 19px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">2009</font></td></tr><tr style="height: 16px"><td style="width: 385px; border-top-style:solid;border-top-width:1px;text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Agricultural </font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,324</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,018</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,666</font></td></tr><tr style="height: 16px"><td style="width: 385px; text-align:left;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Automotive </font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 1,510</font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 1,271</font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 854</font></td></tr><tr style="height: 16px"><td style="width: 385px; text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Chemicals </font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,815</font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,425</font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,102</font></td></tr><tr style="height: 16px"><td style="width: 385px; text-align:left;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Energy </font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 4,084</font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,489</font></td><td style="width: 19px; text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,118</font></td></tr><tr style="height: 16px"><td style="width: 385px; text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Industrial Products </font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,166</font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,639</font></td><td style="width: 19px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,147</font></td></tr><tr style="height: 16px"><td style="width: 385px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Intermodal </font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,609</font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 3,227</font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 2,486</font></td></tr><tr style="height: 16px"><td style="width: 385px; border-top-style:solid;border-top-width:1px;text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Total freight revenues </font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 18,508</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 16,069</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 13,373</font></td></tr><tr style="height: 16px"><td style="width: 385px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Other revenues </font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 1,049</font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 896</font></td><td style="width: 19px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:19px;"> </td><td style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 770</font></td></tr><tr style="height: 24px"><td style="width: 385px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:385px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Total operating revenues </font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 19,557</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 16,965</font></td><td style="width: 19px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:19px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 61px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:2px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:61px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 14,143</font></td></tr></table></div><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><p style='margin-top:12pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;margin-left:0px;">Although our revenues are principally derived from customers domiciled in the </font><font style="font-family:Arial;font-size:10pt;">U.S</font><font style="font-family:Arial;font-size:10pt;">.</font><font style="font-family:Arial;font-size:10pt;">, the ultimate points of origination or destination for some products transported </font><font style="font-family:Arial;font-size:10pt;">by us </font><font style="font-family:Arial;font-size:10pt;">are outside the </font><font style="font-family:Arial;font-size:10pt;">U.S</font><font style="font-family:Arial;font-size:10pt;">.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:5pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0px;">Basis of Presentation</font><font style="font-family:Arial;font-size:10pt;"> – </font><font style="font-family:Arial;font-size:10pt;">The C</font><font style="font-family:Arial;font-size:10pt;">onsolidated </font><font style="font-family:Arial;font-size:10pt;">F</font><font style="font-family:Arial;font-size:10pt;">inancial </font><font style="font-family:Arial;font-size:10pt;">S</font><font style="font-family:Arial;font-size:10pt;">tatements are presented in accordance with accounting principles generally accepted in</font><font style="font-family:Arial;font-size:10pt;"> the </font><font style="font-family:Arial;font-size:10pt;">U.S</font><font style="font-family:Arial;font-size:10pt;">.</font><font style="font-family:Arial;font-size:10pt;"> (</font><font style="font-family:Arial;font-size:10pt;">GAAP) as codified in the Financial Accounting Standards Board (FASB) Accounting Standards Codification</font><font style="font-family:Arial;font-size:10pt;"> (ASC)</font><font style="font-family:Arial;font-size:10pt;">.</font><font style="font-family:Arial;font-size:10pt;"> Certain prior year amounts have been </font><font style="font-family:Arial;font-size:10pt;">disaggregated</font><font style="font-family:Arial;font-size:10pt;"> to </font><font style="font-family:Arial;font-size:10pt;">provide more detail and </font><font style="font-family:Arial;font-size:10pt;">conform to the current period financial statement presentation.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p>
CY2010	us-gaap	Restricted Stock Expense RestrictedStockExpense	57000000	USD
CY2011	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	18000000	USD
CY2011	us-gaap	Restricted Stock Expense RestrictedStockExpense	64000000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	82000000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	83000000	USD
CY2010	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	17000000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	74000000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	51000000	USD
CY2009	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	19000000	USD
CY2009	us-gaap	Restricted Stock Expense RestrictedStockExpense	39000000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	58000000	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	10000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	1649000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-1587000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-1098000000	USD
CY2011	unp	Performance Retention Awards Present Value Calculation Assumptions Textblock PerformanceRetentionAwardsPresentValueCalculationAssumptionsTextblock	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Arial;font-size:10pt;margin-left:0px;">The assumptions used to calculate the present value of estimated future dividends related to the </font><font style="font-family:Arial;font-size:10pt;">February </font><font style="font-family:Arial;font-size:10pt;">201</font><font style="font-family:Arial;font-size:10pt;">1</font><font style="font-family:Arial;font-size:10pt;"> </font><font style="font-family:Arial;font-size:10pt;">grant were as follows:</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 16px"><td style="width: 552px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:552px;"> </td><td colspan="2" style="width: 72px; border-top-style:solid;border-top-width:2px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:72px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">2011</font></td></tr><tr style="height: 16px"><td style="width: 552px; border-top-style:solid;border-top-width:1px;text-align:left;background-color:#D8D8D8;border-color:#000000;min-width:552px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Dividend per share per quarter </font></td><td style="width: 27px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:27px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 45px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#D8D8D8;border-color:#000000;min-width:45px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> 0.38</font></td></tr><tr style="height: 16px"><td style="width: 552px; border-bottom-style:solid;border-bottom-width:2px;text-align:left;border-color:#000000;min-width:552px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;"> Risk-free interest rate at date of grant </font></td><td style="width: 27px; border-bottom-style:solid;border-bottom-width:2px;text-align:right;border-color:#000000;min-width:27px;"> </td><td style="width: 45px; border-bottom-style:solid;border-bottom-width:2px;text-align:right;border-color:#000000;min-width:45px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">1.2%</font></td></tr></table></div>
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	32374343	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	32904291	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	33559150	shares
CY2010Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	103000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	1201000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	62000000	USD
CY2012	us-gaap	Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear	100000000	USD
CY2012	us-gaap	Defined Benefit Plan Amortization Of Net Prior Service Cost Credit DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit	-16000000	USD
CY2012	us-gaap	Defined Benefit Plan Amortization Of Net Gains Losses DefinedBenefitPlanAmortizationOfNetGainsLosses	-116000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Equity Securities DefinedBenefitPlanEquitySecurities	0.58
CY2011Q4	us-gaap	Defined Benefit Plan Debt Securities DefinedBenefitPlanDebtSecurities	0.32
CY2011Q4	us-gaap	Defined Benefit Plan Real Estate DefinedBenefitPlanRealEstate	0.05
CY2011Q4	us-gaap	Defined Benefit Plan Other Plan Assets DefinedBenefitPlanOtherPlanAssets	0.05
CY2011Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2010Q4	us-gaap	Defined Benefit Plan Equity Securities DefinedBenefitPlanEquitySecurities	0.60
CY2010Q4	us-gaap	Defined Benefit Plan Debt Securities DefinedBenefitPlanDebtSecurities	0.31
CY2010Q4	us-gaap	Defined Benefit Plan Real Estate DefinedBenefitPlanRealEstate	0.04
CY2010Q4	us-gaap	Defined Benefit Plan Other Plan Assets DefinedBenefitPlanOtherPlanAssets	0.05
CY2010Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMinimum	0.47
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum	0.63
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMinimum	0.3
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMaximum	0.4
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstateRangeMinimum	0.02
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstateRangeMaximum	0.08
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Other Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsOtherRangeMinimum	0.04
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Other Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsOtherRangeMaximum	0.06
CY2011	us-gaap	Defined Benefit Plan Narrative Description Of Basis Used To Determine Overall Expected Long Term Rate Of Return On Assets Assumption DefinedBenefitPlanNarrativeDescriptionOfBasisUsedToDetermineOverallExpectedLongTermRateOfReturnOnAssetsAssumption	The investment strategy for pension plan assets is to maintain a broadly diversified portfolio designed to achieve our target average long-term rate of return of 7.5%.
CY2011	us-gaap	Defined Benefit Plan Risk Management Practices DefinedBenefitPlanRiskManagementPractices	While we believe we can achieve a long-term average rate of return of 7.5%, we cannot be certain that the portfolio will perform to our expectations.
CY2011	us-gaap	Defined Benefit Plan Prohibited Investments DefinedBenefitPlanProhibitedInvestments	The investment of pension plan assets in securities issued by Union Pacific is specifically prohibited by the plan for both the equity and debt portfolios, other than through index fund holdings.
CY2011	us-gaap	Description Of Defined Contribution Pension And Other Postretirement Plans DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	We provide a defined contribution plan (401(k)/thrift plan) to eligible non-union employees for whom we make matching contributions. We match 50 cents for each dollar contributed by employees up to the first six percent of compensation contributed.
CY2011	unp	Railroad Retirement System Description RailroadRetirementSystemDescription	All Railroad employees are covered by the Railroad Retirement System (the System).
CY2011	us-gaap	Description Of Multiemployer Plan DescriptionOfMultiemployerPlan	Under collective bargaining agreements, we participate in multi-employer benefit plans that provide certain postretirement health care and life insurance benefits for eligible union employees.
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	14000000	USD
CY2011	unp	Railroad Retirement System Contributions RailroadRetirementSystemContributions	600000000	USD
CY2011	us-gaap	Multiemployer Plan Period Contributions MultiemployerPlanPeriodContributions	66000000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	13000000	USD
CY2010	unp	Railroad Retirement System Contributions RailroadRetirementSystemContributions	566000000	USD
CY2010	us-gaap	Multiemployer Plan Period Contributions MultiemployerPlanPeriodContributions	60000000	USD
CY2009	us-gaap	Multiemployer Plan Period Contributions MultiemployerPlanPeriodContributions	48000000	USD
CY2009	unp	Railroad Retirement System Contributions RailroadRetirementSystemContributions	562000000	USD
CY2009	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	14000000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	894000000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	4000000	USD
CY2010	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	84000000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	986000000	USD
CY2011	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	80000000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	3000000	USD
CY2011	unp	Nonoperating Environmental Costs And Other NonoperatingEnvironmentalCostsAndOther	9000000	USD
CY2010	unp	Nonoperating Environmental Costs And Other NonoperatingEnvironmentalCostsAndOther	38000000	USD
CY2009	unp	Nonoperating Environmental Costs And Other NonoperatingEnvironmentalCostsAndOther	45000000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	5000000	USD
CY2009	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	73000000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5000000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-21000000	USD
CY2009	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	43000000	USD
CY2010	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	25000000	USD
CY2009	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	162000000	USD
CY2009Q2	unp	Land Sale To Regional Transportation District LandSaleToRegionalTransportationDistrict	118000000	USD
CY2009Q2	unp	Pre Tax Gain On Land Sale To Regional Transportation District PreTaxGainOnLandSaleToRegionalTransportationDistrict	116000000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	862000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	124000000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	70000000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	964000000	USD
CY2011	unp	Unrecognized Federal Tax Benefits Expense Benefit UnrecognizedFederalTaxBenefitsExpenseBenefit	11000000	USD
CY2011	unp	Unrecognized State And Local Tax Benefits Expense Benefit UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit	11000000	USD
CY2011	unp	Unrecognized Tax Benefits Expense Benefit UnrecognizedTaxBenefitsExpenseBenefit	22000000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	1972000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	862000000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	981000000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	119000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	550000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	647000000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	97000000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	1653000000	USD
CY2010	unp	Unrecognized Federal Tax Benefits Expense Benefit UnrecognizedFederalTaxBenefitsExpenseBenefit	26000000	USD
CY2010	unp	Unrecognized State And Local Tax Benefits Expense Benefit UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit	-1000000	USD
CY2010	unp	Unrecognized Tax Benefits Expense Benefit UnrecognizedTaxBenefitsExpenseBenefit	25000000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	316000000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	366000000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	50000000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	650000000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	680000000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	30000000	USD
CY2009	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	1084000000	USD
CY2009	unp	Unrecognized Federal Tax Benefits Expense Benefit UnrecognizedFederalTaxBenefitsExpenseBenefit	39000000	USD
CY2009	unp	Unrecognized State And Local Tax Benefits Expense Benefit UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit	-1000000	USD
CY2009	unp	Unrecognized Tax Benefits Expense Benefit UnrecognizedTaxBenefitsExpenseBenefit	38000000	USD
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.005
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.004
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.375
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.007
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.373
CY2009	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2009	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.008
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.364
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	-0.005
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	-0.003
CY2009	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	-0.008
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	30000000	USD
CY2011	unp	Increases Decreases For Interest And Penalties IncreasesDecreasesForInterestAndPenalties	-9000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-13312000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-207000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	-13519000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1457000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-12062000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1463000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-11296000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-12581000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-178000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	-12759000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	259000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	197000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	294000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	291000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	197000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	300000000	USD
CY2011Q4	unp	Deferred Tax Assetstax Deferred Expense Reserves Accruals Debt Leases DeferredTaxAssetstaxDeferredExpenseReservesAccrualsDebtLeases	365000000	USD
CY2010Q4	unp	Deferred Tax Assetstax Deferred Expense Reserves Accruals Debt Leases DeferredTaxAssetstaxDeferredExpenseReservesAccrualsDebtLeases	452000000	USD
CY2010Q4	unp	Deferred Tax Assets Tax Deferred Expense Compensation Benefits Pensions Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationBenefitsPensionsPostretirementBenefits	223000000	USD
CY2011Q4	unp	Deferred Tax Assets Tax Deferred Expense Compensation Benefits Pensions Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationBenefitsPensionsPostretirementBenefits	342000000	USD
CY2011	us-gaap	Valuation Allowance Methodologies And Assumptions ValuationAllowanceMethodologiesAndAssumptions	Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized upon settlement. Unrecognized tax benefits are tax benefits claimed in our tax returns that do not meet these recognition and measurement standards.
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	86000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	81000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	28000000	USD
CY2009	unp	Increases Decreases For Interest And Penalties IncreasesDecreasesForInterestAndPenalties	3000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	5000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	27000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	4000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	3000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	107000000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	61000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	38000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	11000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	22000000	USD
CY2010	unp	Increases Decreases For Interest And Penalties IncreasesDecreasesForInterestAndPenalties	5000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	26000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	18000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	50000000	USD
CY2011	us-gaap	Income Tax Examination Description IncomeTaxExaminationDescription	Internal Revenue Service (IRS) examinations have been completed and settled for all years prior to 1999, and the statute of limitations bars any additional tax assessments. Interest calculations may remain open for years prior to 1999. In the second quarter of 2011, the IRS completed its examination and issued a notice of deficiency for tax years 2007 and 2008. The IRS has now completed its examinations and issued notices of deficiency for tax years 1999 through 2008. We disagree with many of their proposed adjustments, and we are at IRS Appeals for these years. Additionally, several state tax authorities are examining our state income tax returns for years 2003 through 2008.
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	80000000	USD
CY2011Q4	unp	Unrecognized Tax Benefits Not Impacting Effective Tax Rate UnrecognizedTaxBenefitsNotImpactingEffectiveTaxRate	-27000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	90000000	USD
CY2010Q4	unp	Unrecognized Tax Benefits Not Impacting Effective Tax Rate UnrecognizedTaxBenefitsNotImpactingEffectiveTaxRate	4000000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	86000000	USD
CY2009Q4	unp	Unrecognized Tax Benefits Not Impacting Effective Tax Rate UnrecognizedTaxBenefitsNotImpactingEffectiveTaxRate	25000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2010Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2011Q4	unp	Current Liability For Unrecognized Tax Benefits CurrentLiabilityForUnrecognizedTaxBenefits	31000000	USD
CY2011Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	10000000	USD
CY2010Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	19000000	USD
CY2010	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	6000000	USD
CY2009	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	-11000000	USD
CY2009Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	14000000	USD
CY2011Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	14000000	USD
CY2011	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	10000000	USD
CY2011Q3	unp	Incometaxexaminationinterestpaidfromsettlementwithtaxingauthority Incometaxexaminationinterestpaidfromsettlementwithtaxingauthority	18000000	USD
CY2011Q3	unp	Incometaxexaminationpayment Incometaxexaminationpayment	45000000	USD
CY2011Q3	unp	Incometaxexaminationtaxpaidfromsettlementwithtaxingauthority Incometaxexaminationtaxpaidfromsettlementwithtaxingauthority	27000000	USD
CY2009	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	6000000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	44000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	199000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	57000000	USD
CY2011	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Retention Shares And Units WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfRetentionSharesAndUnits	1500000	shares
CY2010	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Retention Shares And Units WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfRetentionSharesAndUnits	1400000	shares
CY2010	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Stock Options WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfStockOptions	3300000	shares
CY2009	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Retention Shares And Units WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfRetentionSharesAndUnits	1300000	shares
CY2009	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Stock Options WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfStockOptions	1500000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	600000	shares
CY2009	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-101000000	USD
CY2011	unp	Weighted Average Number Of Shares Outstanding Dilutive Effect Of Stock Options WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfStockOptions	2600000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	300000	shares
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4600000	shares
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-301000000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-20000000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	1000000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	1000000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	7000000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-88000000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	0	USD
CY2011Q4	unp	Value Of Interest Retained ValueOfInterestRetained	1100000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	1004000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-48000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-2000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	703000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-28000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-3000000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	9000000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5000000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Noncurrent AllowanceForDoubtfulAccountsReceivableNoncurrent	51000000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Noncurrent AllowanceForDoubtfulAccountsReceivableNoncurrent	41000000	USD
CY2011Q4	unp	Total Transfer Capacity Undivided Interests To Investors Under Receivables Securitization Facility TotalTransferCapacityUndividedInterestsToInvestorsUnderReceivablesSecuritizationFacility	600000000	USD
CY2011Q4	unp	Value Outstanding Undivided Interest Held By Investors Under Receivables Securitization Facility ValueOutstandingUndividedInterestHeldByInvestorsUnderReceivablesSecuritizationFacility	100000000	USD
CY2010Q4	unp	Total Transfer Capacity Undivided Interests To Investors Under Receivables Securitization Facility TotalTransferCapacityUndividedInterestsToInvestorsUnderReceivablesSecuritizationFacility	600000000	USD
CY2010Q4	unp	Value Outstanding Undivided Interest Held By Investors Under Receivables Securitization Facility ValueOutstandingUndividedInterestHeldByInvestorsUnderReceivablesSecuritizationFacility	100000000	USD
CY2010Q4	unp	Value Of Interest Retained ValueOfInterestRetained	960000000	USD
CY2010Q4	unp	Accounts Receivable Supporting Undivided Investor Held Interest AccountsReceivableSupportingUndividedInvestorHeldInterest	960000000	USD
CY2011Q4	unp	Accounts Receivable Supporting Undivided Investor Held Interest AccountsReceivableSupportingUndividedInvestorHeldInterest	1100000000	USD
CY2011	unp	Receivables Collected ReceivablesCollected	18800000000	USD
CY2011	unp	Receivables Securitization Facility Interest Expense Cost ReceivablesSecuritizationFacilityInterestExpenseCost	4000000	USD
CY2010	unp	Receivables Collected ReceivablesCollected	16300000000	USD
CY2010	unp	Receivables Securitization Facility Interest Expense Cost ReceivablesSecuritizationFacilityInterestExpenseCost	6000000	USD
CY2009	unp	Receivables Securitization Facility Other Income Cost ReceivablesSecuritizationFacilityOtherIncomeCost	9000000	USD
CY2011Q4	unp	Propertyplantandequipmenttotalcost Propertyplantandequipmenttotalcost	54444000000	USD
CY2011Q4	unp	Propertyplantandequipmenttotalaccumulateddepreciation Propertyplantandequipmenttotalaccumulateddepreciation	14510000000	USD
CY2011	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	2200000000	USD
CY2010	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	2000000000	USD
CY2009	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	1900000000	USD
CY2010Q4	unp	Propertyplantandequipmenttotalcost Propertyplantandequipmenttotalcost	51908000000	USD
CY2010Q4	unp	Propertyplantandequipmenttotalaccumulateddepreciation Propertyplantandequipmenttotalaccumulateddepreciation	13655000000	USD
CY2011	us-gaap	Property Plant And Equipment Additional Disclosures PropertyPlantAndEquipmentAdditionalDisclosures	We currently have more than 60 depreciable asset classes, and we may increase or decrease the number of asset classes due to changes in technology, asset strategies, or other factors.
CY2011Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	10500000000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	819000000	USD
CY2011Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	363000000	USD
CY2011Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	482000000	USD
CY2011Q4	unp	Accrued Casualty Costs AccruedCasualtyCosts	249000000	USD
CY2011Q4	unp	Equipment Rents Payable EquipmentRentsPayable	90000000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	624000000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	548000000	USD
CY2010Q4	unp	Equipment Rents Payable EquipmentRentsPayable	86000000	USD
CY2010Q4	unp	Accrued Casualty Costs AccruedCasualtyCosts	325000000	USD
CY2010Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	337000000	USD
CY2010Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	357000000	USD
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	677000000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	197000000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	200000000	USD
CY2011	us-gaap	Gain Loss On Components Excluded From Assessment Of Interest Rate Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfInterestRateFairValueHedgeEffectiveness	0	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	0	USD
CY2010	us-gaap	Gain Loss On Components Excluded From Assessment Of Interest Rate Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfInterestRateFairValueHedgeEffectiveness	2000000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	2000000	USD
CY2009	us-gaap	Gain Loss On Components Excluded From Assessment Of Interest Rate Fair Value Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfInterestRateFairValueHedgeEffectiveness	8000000	USD
CY2009	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	8000000	USD
CY2010Q1	us-gaap	Notional Amount Of Interest Rate Fair Value Hedge Derivatives NotionalAmountOfInterestRateFairValueHedgeDerivatives	250000000	USD
CY2010Q1	unp	Early Termination Cash Received EarlyTerminationCashReceived	20000000	USD
CY2010Q1	us-gaap	Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge	16000000	USD
CY2010Q1	unp	Cash Received For Accrued But Unpaid Interest Receivable CashReceivedForAccruedButUnpaidInterestReceivable	4000000	USD
CY2010Q4	us-gaap	Interest Rate Fair Value Hedge Derivative At Fair Value Net InterestRateFairValueHedgeDerivativeAtFairValueNet	0	USD
CY2011	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	2000000	USD
CY2011Q2	unp	Accrued Interest Debt Exchange Existing Notes AccruedInterestDebtExchangeExistingNotes	17000000	USD
CY2010	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	3000000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Derivative At Fair Value Net InterestRateCashFlowHedgeDerivativeAtFairValueNet	0	USD
CY2010Q4	us-gaap	Interest Rate Cash Flow Hedge Derivative At Fair Value Net InterestRateCashFlowHedgeDerivativeAtFairValueNet	0	USD
CY2010Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	10400000000	USD
CY2011Q4	unp	Fixed Rate Debt Securities Containing Call Provisions FixedRateDebtSecuritiesContainingCallProvisions	303000000	USD
CY2010Q4	unp	Fixed Rate Debt Securities Containing Call Provisions FixedRateDebtSecuritiesContainingCallProvisions	303000000	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2010Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2011Q4	us-gaap	Interest Rate Fair Value Hedge Derivative At Fair Value Net InterestRateFairValueHedgeDerivativeAtFairValueNet	0	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	8906000000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	9242000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	706000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	467000000	USD
CY2010Q3	us-gaap	Debt Issuance Costs Incurred During Noncash Or Partial Noncash Transaction DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction	2000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	309000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	636000000	USD
CY2011Q2	us-gaap	Debt Conversion Converted Instrument Issuance Date Day Month And Year DebtConversionConvertedInstrumentIssuanceDateDayMonthAndYear	2011-06-23
CY2011Q2	us-gaap	Debt Conversion Converted Instrument Rate DebtConversionConvertedInstrumentRate	0.04163
CY2011Q2	us-gaap	Debt Conversion Converted Instrument Expiration Or Due Date Day Month And Year DebtConversionConvertedInstrumentExpirationOrDueDateDayMonthAndYear	2022-07-15
CY2011Q2	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	267000000	USD
CY2011Q2	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	750000000	USD
CY2010Q3	us-gaap	Debt Conversion Converted Instrument Issuance Date Day Month And Year DebtConversionConvertedInstrumentIssuanceDateDayMonthAndYear	2010-07-14
CY2011Q4	unp	Fair Value Of Total Debt In Excess Of Carrying Value FairValueOfTotalDebtInExcessOfCarryingValue	1600000000	USD
CY2010Q4	unp	Fair Value Of Total Debt In Excess Of Carrying Value FairValueOfTotalDebtInExcessOfCarryingValue	1200000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	517000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	6271000000	USD
CY2011Q4	unp	Debt Instrument Covenant In Compliance DebtInstrumentCovenantInCompliance	At December 31, 2011, and December 31, 2010 (and at all times during the year), we were in compliance with this covenant.
CY2011Q3	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	500000000	USD
CY2011Q3	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0475
CY2011Q3	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2041-09-15
CY2011Q3	us-gaap	Debt Instrument Issuance Date DebtInstrumentIssuanceDate	August 9, 2011
CY2011Q2	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	857000000	USD
CY2010Q3	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	376000000	USD
CY2010Q3	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	96000000	USD
CY2010Q3	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	376000000	USD
CY2010Q3	unp	Accrued Interest Debt Exchange Existing Notes AccruedInterestDebtExchangeExistingNotes	15000000	USD
CY2011Q4	unp	Carrying Value Of Equipment Serving As Collateral For Capital Leases And Other Types Of Equipment Obligations CarryingValueOfEquipmentServingAsCollateralForCapitalLeasesAndOtherTypesOfEquipmentObligations	2900000000	USD
CY2010Q4	unp	Carrying Value Of Equipment Serving As Collateral For Capital Leases And Other Types Of Equipment Obligations CarryingValueOfEquipmentServingAsCollateralForCapitalLeasesAndOtherTypesOfEquipmentObligations	3200000000	USD
CY2011Q4	unp	Allowable Debt Per Debt To Net Worth Coverage Ratio As Defined Facility AllowableDebtPerDebtToNetWorthCoverageRatioAsDefinedFacility	37200000000	USD
CY2011Q2	us-gaap	Debt Issuance Costs Incurred During Noncash Or Partial Noncash Transaction DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction	6000000	USD
CY1997Q1	unp	Value Of Missouri Pacific Railroad Company Assets That Secured Mortgage Bonds ValueOfMissouriPacificRailroadCompanyAssetsThatSecuredMortgageBonds	6000000000	USD
CY2011Q4	unp	Outstanding Debt As Defined By Facility OutstandingDebtAsDefinedByFacility	9500000000	USD
CY2010Q3	us-gaap	Debt Conversion Original Debt Interest Rate Of Debt DebtConversionOriginalDebtInterestRateOfDebt	0.07875
CY2011Q3	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	100000000	USD
CY2011Q3	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2016-08-05
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2011Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1800000000	USD
CY2011Q4	us-gaap	Commercial Paper CommercialPaper	0	USD
CY2011	us-gaap	Proceeds From Issuance Of Commercial Paper ProceedsFromIssuanceOfCommercialPaper	0	USD
CY2011	us-gaap	Repayments Of Commercial Paper RepaymentsOfCommercialPaper	0	USD
CY2011Q2	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1900000000	USD
CY2010Q4	unp	Secured Debt Under Receivables Securitization Facility SecuredDebtUnderReceivablesSecuritizationFacility	100000000	USD
CY2011Q4	unp	Secured Debt Under Receivables Securitization Facility SecuredDebtUnderReceivablesSecuritizationFacility	100000000	USD
CY2011Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	13800000000	USD
CY2010Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	12900000000	USD
CY2011Q4	unp	Debt Reclassified As Long Term DebtReclassifiedAsLongTerm	100000000	USD
CY2010Q4	unp	Debt Reclassified As Long Term DebtReclassifiedAsLongTerm	100000000	USD
CY2011	us-gaap	Line Of Credit Facility Expiration Date LineOfCreditFacilityExpirationDate	May 2015
CY2010Q3	us-gaap	Debt Conversion Converted Instrument Expiration Or Due Date Day Month And Year DebtConversionConvertedInstrumentExpirationOrDueDateDayMonthAndYear	2040-07-15
CY2010Q3	us-gaap	Debt Conversion Original Debt Issuance Date Of Debt Year DebtConversionOriginalDebtIssuanceDateOfDebtYear	2019
CY2011Q4	unp	Board Of Directors Remaining Debt Issuance BoardOfDirectorsRemainingDebtIssuance	2000000000	USD
CY2010Q3	us-gaap	Debt Conversion Converted Instrument Rate DebtConversionConvertedInstrumentRate	0.0578
CY2011Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5000000	USD
CY2010Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16000000	USD
CY2010Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5000000	USD
CY2011Q4	unp	Future Minimum Lease Payments Vies FutureMinimumLeasePaymentsVies	3900000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	297000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	269000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	276000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	276000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	262000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	1179000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	2559000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	685000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	1874000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	525000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	489000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	415000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	372000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	347000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	2380000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	4528000000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	2458000000	USD
CY2010Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	2520000000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	915000000	USD
CY2010Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	901000000	USD
CY2011	unp	Rent Expense For Operating Leases RentExpenseForOperatingLeases	637000000	USD
CY2010	unp	Rent Expense For Operating Leases RentExpenseForOperatingLeases	624000000	USD
CY2009	unp	Rent Expense For Operating Leases RentExpenseForOperatingLeases	686000000	USD
CY2011Q2	unp	Treasury Stock Acquired Repurchase Board Authorization TreasuryStockAcquiredRepurchaseBoardAuthorization	Effective April 1, 2011, our Board of Directors authorized the repurchase of 40 million shares of our common stock by March 31, 2014, replacing our previous repurchase program.
CY2011	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	95.94
CY2011Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	94.10
CY2011Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	100.75
CY2011Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	91.45
CY2011Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	98.16
CY2010Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0
CY2010Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	71.74
CY2010Q3	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	73.19
CY2010Q4	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	89.39
CY2010	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	75.06
CY2011	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-14779770	shares
CY2011Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-2636178	shares
CY2011Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-3576399	shares
CY2011Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-4681535	shares
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	1617000000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	964000000	USD
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.01
CY2010Q1	us-gaap	Revenues Revenues	3965000000	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	1313000000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	775000000	USD
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.58
CY2011Q1	us-gaap	Revenues Revenues	4490000000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	1137000000	USD
CY2011Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-3885658	shares
CY2010Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2010Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-6496400	shares
CY2010Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-7643400	shares
CY2010Q4	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-2500596	shares
CY2010	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	-16640396	shares
CY2011Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	27856408	shares
CY2011Q4	unp	Stock Repurchased Since Inception Value StockRepurchasedSinceInceptionValue	5700000000	USD
CY2010Q4	us-gaap	Revenues Revenues	4410000000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	639000000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
CY2011Q2	us-gaap	Revenues Revenues	4858000000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1392000000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	785000000	USD
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2011Q3	us-gaap	Revenues Revenues	5101000000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1578000000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	904000000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.87
CY2011Q4	us-gaap	Revenues Revenues	5108000000	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	988000000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	516000000	USD
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2010Q2	us-gaap	Revenues Revenues	4182000000	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1279000000	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	711000000	USD
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.42
CY2010Q3	us-gaap	Revenues Revenues	4408000000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1401000000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	778000000	USD
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.58
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.85
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.99
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.40
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.56
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.56

Files In Submission

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$UNP
UNION PACIFIC CORP Stock $unp

2011 Form 10-K Financial Statement

#000119312512038569 Filed on February 03, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UNP UNION PACIFIC CORP Stock $unp

2011 Form 10-K Financial Statement

#000119312512038569 Filed on February 03, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$UNP
UNION PACIFIC CORP Stock $unp