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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
May 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Repurchase and retirement of common stock $ 325 $ 325 $ 0 $ 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 $ 68       $ 68    
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 $ 16       $ 16    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         134.00%    
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 $ 866       $ 866    
Weighted-average service period         1 year 10 months 24 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 779       $ 779    
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) $ 27   $ 15   $ 51 $ 38