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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Period End Date Mar. 31, 2019    
Number of Options, Balance 0    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 12 $ 13  
Options outstanding, intrinsic value 0   $ 1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 45    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   1 month  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 8 months    
Performance-Based and Market-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years    
Weighted Average Grant Price, Balance $ 35.14    
Weighted Average Grant Price, Granted at fair market value 34.82    
Weighted Average Grant Price, Vested/exercised 0.00    
Weighted Average Grant Price, Canceled 24.23    
Weighted Average Grant Price, Balance $ 38.66    
Number of RSUs, Balance 1,169    
Number of RSUs, Granted at fair market value 480    
Number of RSUs, Vested/exercised 0    
Number of RSUs, Canceled (413)    
Number of RSUs, Balance 1,236    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 43    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 487    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 39.81    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 2 years 3 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 17    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Price, Balance $ 38.67    
Weighted Average Grant Price, Granted at fair market value 34.82 $ 48.66  
Weighted Average Grant Price, Vested/exercised 35.56    
Weighted Average Grant Price, Canceled $ 39.40    
Number of RSUs, Balance 838    
Number of RSUs, Granted at fair market value 422    
Number of RSUs, Vested/exercised (336)    
Number of RSUs, Canceled (27)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 897    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 38.01    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 5 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 31