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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 443	$ 192	$ 414
State	88	50	61
Foreign	38	36	56
Current total	569	278	531
Deferred:
Federal	57	43	(89)
State	17	(17)	(33)
Foreign	(1)	4	4
Deferred total	73	30	(118)
Provision for income taxes	$ 642	$ 308	$ 413

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