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Debt (Amortization of Fair Value Adjustment) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]      
Amortization of debt discount $ 0 $ 0 $ 7
Amortization of debt issuance fees 3 3 3
Amortization of original issue discount 2 2 1
Interest expense associated with amortization of fair value adjustment and original issue discount $ 5 $ 5 $ 11