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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, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 17 $ 12
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 32  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 10 months 24 days  
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 2 months 12 days  
Weighted Average Grant Price, Balance $ 38.89  
Weighted Average Grant Price, Granted at fair market value 21.09  
Weighted Average Grant Price, Vested/exercised 36.64  
Weighted Average Grant Price, Canceled 35.54  
Weighted Average Grant Price, Balance $ 32.01  
Number of RSUs, Balance 1,061  
Number of RSUs, Granted at fair market value 515  
Number of RSUs, Vested/exercised (73)  
Number of RSUs, Canceled (380)  
Number of RSUs, Balance 1,123  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 16  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 257  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 21.09  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 2 years 10 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 4  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted Average Grant Price, Balance $ 36.99  
Weighted Average Grant Price, Granted at fair market value 21.67 $ 34.82
Weighted Average Grant Price, Vested/exercised 38.29  
Weighted Average Grant Price, Canceled $ 38.91  
Number of RSUs, Balance 847  
Number of RSUs, Granted at fair market value 568  
Number of RSUs, Vested/exercised (376)  
Number of RSUs, Canceled (34)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 1,005  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 27.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 7 months 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 14