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Income Taxes - Components of Income Tax Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Federal        
Current $ 421 $ 626 $ 911 $ 1,116
Deferred 38 (104) (29) (92)
Federal income tax 459 522 882 1,024
State        
Current 84 19 167 77
Deferred 4 (12) (6) (14)
State income tax 88 7 161 63
Applicable income taxes $ 547 $ 529 $ 1,043 $ 1,087