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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Balance 0   57
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 18 $ 20  
Options outstanding, intrinsic value 0   $ 1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 36    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 6 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 1 year 7 months 6 days    
Weighted Average Grant Price, Balance $ 35.14    
Weighted Average Grant Price, Granted at fair market value 34.56 $ 48.52  
Weighted Average Grant Price, Vested/exercised 0    
Weighted Average Grant Price, Canceled 24.85    
Weighted Average Grant Price, Balance $ 38.27   $ 35.14
Number of RSUs, Balance 1,169    
Number of RSUs, Granted at fair market value 570    
Number of RSUs, Vested/exercised 0    
Number of RSUs, Canceled (430)    
Number of RSUs, Balance 1,309   1,169
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 37    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 524    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 39.31    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 15    
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 34.17 $ 48.41  
Weighted Average Grant Price, Vested/exercised 36.00    
Weighted Average Grant Price, Canceled $ 38.76    
Weighted Average Grant Price, Balance     $ 38.67
Number of RSUs, Balance 838    
Number of RSUs, Granted at fair market value 606    
Number of RSUs, Vested/exercised (502)    
Number of RSUs, Canceled (56)    
Number of RSUs, Balance     838
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 886    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 37.10    
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    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 25