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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 08, 2017
May 04, 2015
Market-Based Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to stock options and restricted stock rights $ 67   $ 67      
Market-Based Restricted Stock Units [Member] | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage range of shares received at vesting based on total stockholder return ("TSR") 0.00%   0.00%      
Market-Based Restricted Stock Units [Member] | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage range of shares received at vesting based on total stockholder return ("TSR") 200.00%   200.00%      
Performance Based Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to stock options and restricted stock rights $ 41   $ 41      
Performance Based Restricted Stock Units [Member] | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage range of shares received at vesting based on total stockholder return ("TSR") 0.00%   0.00%      
Performance Based Restricted Stock Units [Member] | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage range of shares received at vesting based on total stockholder return ("TSR") 200.00%   200.00%      
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to stock options and restricted stock rights $ 1   $ 1      
Restricted Stock Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to stock options and restricted stock rights 429   $ 429      
Weighted-average service period     2 years      
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to stock options and restricted stock rights $ 320   $ 320      
May 2015 Repurchase Program [Member] [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amount of common stock authorized for repurchase           $ 1,000
Stock Repurchased and Retired During Period, Shares 0.0 1.6 0.3 3.5    
Repurchase and retirement of common stock $ 0 $ 127 $ 31 $ 256    
May 2017 Repurchase Program [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amount of common stock authorized for repurchase         $ 1,200  
Stock Repurchased and Retired During Period, Shares 1.3   2.4      
Repurchase and retirement of common stock $ 153   $ 272      
Repurchase Program, Total [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Repurchased and Retired During Period, Shares 1.3 1.6 2.7 3.5    
Repurchase and retirement of common stock $ 153 $ 127 $ 303 $ 256    
Stock-based compensation expense [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Deferred Income Tax Expense (Benefit) $ 12 $ 9 22 $ 18    
Accounting Standards Update 2016-09 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cumulative Effect on Retained Earnings, Net of Tax     $ 8