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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, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Period End Date Sep. 30, 2017    
Number of Options, Balance 796   810
Options outstanding, intrinsic value $ 28   $ 27
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 23 $ 27  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 6 months   2 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 100    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 36.64    
Performance-Based and Market-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Price, Balance 34.11    
Weighted Average Grant Price, Granted at fair market value 35.21 $ 23.33  
Weighted Average Grant Price, Vested/exercised 36.55    
Weighted Average Grant Price, Canceled 38.73    
Weighted Average Grant Price, Balance $ 33.03   $ 34.11
Number of RSUs, Balance 923    
Number of RSUs, Granted at fair market value 572    
Number of RSUs, Vested/exercised (146)    
Number of RSUs, Canceled (304)    
Number of RSUs, Balance 1,045   923
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 3 months    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Price, Balance $ 34.83    
Weighted Average Grant Price, Granted at fair market value 35.32 $ 25.92  
Weighted Average Grant Price, Vested/exercised 37.11    
Weighted Average Grant Price, Canceled 32.53    
Weighted Average Grant Price, Balance $ 34.50   $ 34.83
Number of RSUs, Balance 878    
Number of RSUs, Granted at fair market value 915    
Number of RSUs, Vested/exercised (470)    
Number of RSUs, Canceled (92)    
Number of RSUs, Balance 1,231   878
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 47    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 40