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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 11, 2018
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 $ 64   $ 64        
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 $ 21   $ 21        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     100.00%        
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%        
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 $ 578   $ 578        
Weighted-average service period     2 years 2 months        
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 $ 493   $ 493        
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 0.0 0.0 0.3      
Repurchase and retirement of common stock $ 0 $ 0 $ 0 $ 31      
May 2015 Repurchase Program [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares       0.3      
Repurchase and retirement of common stock       $ 31      
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 0.0 1.3 0.6 2.4      
Repurchase and retirement of common stock $ 0 $ 153 $ 76 $ 272      
May 2018 Repurchase Program [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Amount of common stock authorized for repurchase         $ 2,400    
Stock Repurchased and Retired During Period, Shares 2.3   4.0        
Repurchase and retirement of common stock $ 299   $ 523        
Repurchase Program, Total [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares 2.3 1.3 4.6 2.7      
Repurchase and retirement of common stock $ 299 $ 153 $ 599 $ 303      
Stock-based compensation expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred Income Tax Expense (Benefit) $ 9 $ 12 $ 17 $ 22