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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ 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]      
Cancellations and forfeitures 0    
Total compensation expense $ 28 $ 33 $ 20
Income tax benefit 9 $ 11 $ 7
Unearned compensation costs related to awards granted $ 47    
Unearned compensation cost, expected to be recognized over period (years) 2 years 3 months 25 days    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unearned compensation cost, expected to be recognized over period (years) 4 years    
Two Thousand Fifteen Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards available for future grants 2,226,493 3,430,707  
Equity awards granted (1,204,214)    
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit $ 1 $ 3  
RSA      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards granted (25,088) (9,194) (12,953)
Date Of Grant | Two Thousand Fifteen Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares that became available under the 2015 Plan 4,000,000.0