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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, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2018    
Document Period End Date Sep. 30, 2018    
Number of Options, Balance 79   273
Options outstanding, intrinsic value $ 2   $ 10
Stock Issued During Period, Value, Restricted Stock Award, Gross 20 $ 23  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 35    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 months   1 year 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year 4 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 3 months    
Weighted Average Grant Price, Balance $ 33.06    
Weighted Average Grant Price, Granted at fair market value 48.52 $ 35.21  
Weighted Average Grant Price, Vested/exercised 0.00    
Weighted Average Grant Price, Canceled 50.06    
Weighted Average Grant Price, Balance $ 35.17   $ 33.06
Number of RSUs, Balance 994    
Number of RSUs, Granted at fair market value 353    
Number of RSUs, Vested/exercised 0    
Number of RSUs, Canceled (176)    
Number of RSUs, Balance 1,171   994
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 38    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 267    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 44.25    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 2 years 1 month    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 9    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Price, Balance $ 34.54    
Weighted Average Grant Price, Granted at fair market value 48.41 $ 35.32  
Weighted Average Grant Price, Vested/exercised 36.01    
Weighted Average Grant Price, Canceled $ 35.97    
Weighted Average Grant Price, Balance     $ 34.54
Number of RSUs, Balance 1,160    
Number of RSUs, Granted at fair market value 321    
Number of RSUs, Vested/exercised (559)    
Number of RSUs, Canceled (75)    
Number of RSUs, Balance     1,160
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number of Shares Outstanding 847    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Grant Date Fair Value $ 38.70    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest $ 27