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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
May 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchase and retirement of common stock $ 325 $ 78  
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 $ 79    
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%    
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%    
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 $ 20    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 129.00%    
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%    
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%    
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 $ 991    
Weighted-average service period 2 years 1 month 6 days    
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 $ 884    
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   0.7  
Repurchase and retirement of common stock   $ 78  
Stock-based compensation expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Income Tax Expense (Benefit) $ 24 $ 22