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Income taxes - Income tax expense reconciliation (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax expense reconciliation      
Earnings before income taxes $ 22,236 $ 15,314 $ 19,051
Hypothetical amounts computed at the U.S. federal statutory rate 7,783 5,360 6,668
Dividends received deduction and tax exempt interest (518) (497) (504)
State income taxes, less federal income tax benefit 250 289 219
Foreign tax rate differences (280) (208) (154)
U.S. income tax credits (319) (241) (182)
BNSF holding gain     (342)
Other differences, net 8 (135) (98)
Total income taxes $ 6,924 $ 4,568 $ 5,607