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(Stock-Based Compensation And Employee Benefit Plans Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Income Tax Expense (Benefit) $ (1,876) $ (16) $ 203
Common Stock, Shares, Outstanding 288.0 298.0  
Deferred Compensation Plan Assets $ 13 $ 11  
Deferred Compensation Liability, Classified, Noncurrent 14 12  
Deferred Compensation Arrangement with Individual, Contributions by Employer 29 43 31
Stock Repurchased and Retired During Period, Value $ 1,207 1,192 601
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 22.4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 22 $ 24 $ 43
2019 Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage Allowed Of Exercise Price Of Stock Options Compared To Fair Market Value On Date Of Grant 100.00%    
2019 Equity Plan | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 13.5    
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Available for Grant, Employee Stock Purchase Plans 5.6    
Minimum Percentage That Employees Authorized For Payroll Deductions 2.00%    
Maximum Percentage That Employees Authorized For Payroll Deductions 10.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 85.00%    
Employee Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP Exercise Price For Shares Issued $ 74.70 $ 89.46 $ 67.56
Employee Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP Exercise Price For Shares Issued $ 74.89 $ 107.51 $ 99.82
Restricted Stock Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 15.7    
Performance Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 68.00%    
Performance Based Restricted Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 0.00%    
Performance Based Restricted Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 200.00%    
Market Based Restricted Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 0.00%    
Market Based Restricted Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 200.00%    
Stock-based compensation expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Income Tax Expense (Benefit) $ 43 $ 40 $ 29
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%