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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
May 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchase and retirement of common stock $ 78 $ 305  
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 $ 127    
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 $ 6    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 86.00%    
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 $ 816    
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 $ 683    
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 3.2  
Repurchase and retirement of common stock $ 78 $ 305  
Stock-based compensation expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Income Tax Expense (Benefit) $ 22 $ 6  
Free cash flow [Member] | Performance Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement Performance-based Milestone Percentage 50.00%