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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Aug. 31, 2022
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Measurement Periods for Performance based Restricted Stock 3 years   3 years    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Measurement Periods for Performance based Restricted Stock 4 years   4 years    
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 $ 33   $ 33    
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 $ 24   $ 24    
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 $ 974   $ 974    
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 917   $ 917    
August 2022 Repurchase Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase         $ 2,600
November 2020 Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase         $ 2,600
Stock-based compensation expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred Income Tax Expense (Benefit) $ 24   $ 45    
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount   $ 27   $ 51