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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 19 $ 18
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 23 $ 23  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 3 months 18 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 1 year 8 months 12 days    
Weighted Average Grant Price, Balance   $ 38.89  
Weighted Average Grant Price, Granted at fair market value $ 21.06    
Weighted Average Grant Price, Vested/exercised 36.64    
Weighted Average Grant Price, Canceled 35.15    
Weighted Average Grant Price, Balance $ 31.64 $ 31.64  
Number of RSUs, Balance   1,061  
Number of RSUs, Granted at fair market value 553    
Number of RSUs, Vested/exercised (73)    
Number of RSUs, Canceled (424)    
Number of RSUs, Balance 1,117 1,117  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 29 $ 29  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 38 38  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 20.70 $ 20.70  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 2 years 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 1 $ 1  
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 $ 23.14   $ 34.17
Weighted Average Grant Price, Vested/exercised 37.82    
Weighted Average Grant Price, Canceled $ 32.90    
Number of RSUs, Balance   847  
Number of RSUs, Granted at fair market value 798    
Number of RSUs, Vested/exercised (420)    
Number of RSUs, Canceled (81)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 1,144 1,144  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 27.31 $ 27.31  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 2 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 30 $ 30