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Income taxes - Income tax expense reconciliation (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income tax expense reconciliation      
Earnings before income taxes $ 15,314 $ 19,051 $ 11,552
Hypothetical amounts computed at the U.S. federal statutory rate 5,360 6,668 4,043
Dividends received deduction and tax exempt interest (497) (504) (512)
State income taxes, less federal income tax benefit 289 219 81
Foreign tax rate differences (208) (154) (92)
U.S. income tax credits (241) (182) (134)
BNSF holding gain   (342)  
Other differences, net (135) (98) 152
Total income taxes $ 4,568 $ 5,607 $ 3,538