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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
May 11, 2018
May 08, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase and retirement of common stock $ 305 $ 300    
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 $ 78      
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 $ 10      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 66.00%      
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 $ 733      
Weighted-average service period 2 years 3 months 18 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 $ 645      
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 0.6    
Repurchase and retirement of common stock $ 0 $ 76    
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 3.2 1.7    
Repurchase and retirement of common stock $ 305 $ 224    
Stock-based compensation expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Income Tax Expense (Benefit) $ 6 $ 8    
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%