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Share-Based Compensation - Weighted-Average Assumptions Used for Grants of Stock Options and SARs (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of interest rates, minimum 0.25% 0.02% 0.02%
Range of interest rates, maximum 1.75% 2.14% 2.61%
Stock Option and Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Forfeiture rate 9.01% 10.24% 10.32%
Volatility 43.14% 33.98% 34.92%
Risk free interest rate 1.29% 1.53% 1.73%
Expected weighted-average life 5 years 3 months 29 days 5 years 3 months 25 days 5 years 4 months 10 days
Fair value of SARs granted (in millions) $ 13 $ 12 $ 5
Weighted-average grant date fair value of SARs granted (per underlying share) (in USD per share) $ 20.18 $ 35.00 $ 24.98