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Long-Term Debt - Summary of Carrying Value of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Carry Value of Debt    
Debt Instrument [Line Items]    
Senior Notes $ 1,050 $ 1,050
Term loan 1,653 2,035
Less debt issuance costs (22) (26)
Less unamortized discounts (33) (47)
Total outstanding debt 2,648 $ 3,012
Revolving Credit Facility    
Debt Instrument [Line Items]    
Less debt issuance costs $ (4)