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Income Taxes - Components of Income Tax Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Federal        
Current $ 390 $ 461 $ 1,506 $ 1,416
Deferred 57 50 (35) 26
Federal income tax 447 511 1,471 1,442
State        
Current 84 77 161 239
Deferred 11 5 (3) 3
State income tax 95 82 158 242
Total income tax provision $ 542 $ 593 $ 1,629 $ 1,684