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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Current income tax expense: Federal $ 937 $ 923 $ 869
Current income tax expense: State and local 74 54 39
Current income tax expense: Foreign 395 258 307
Total net current income tax expense 1,406 1,235 1,215
Deferred income tax expense (benefit): Federal (13) (73) (68)
Deferred income tax expense (benefit): State and local (19) (9) 13
Deferred income tax expense (benefit): Foreign (124) (22) (138)
Total net deferred income tax expense (benefit) (156) (104) (193)
Total income tax expense $ 1,250 $ 1,131 $ 1,022