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(Restricted Stock Rights) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Vesting Year4 [Member]      
Cliff Vesting Period 4 years    
Stock-based compensation expense [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 688.0    
Restricted Stock Units (RSUs) [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 634.0    
Restricted Stock Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 8.7    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 139.66 $ 127.27 $ 93.52
Reduction In Shares Available Per Grant Of Stock Right 1.43    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 457.0 $ 420.0 $ 240.0
Market Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 46.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 170.44 $ 145.78 $ 109.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 37.0 $ 19.0 $ 9.0
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 12.5    
Performance Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 8.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 140.48    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 147.00%    
Minimum [Member] | Market Based Restricted Stock Units [Member]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 0.00%    
Minimum [Member] | Performance Based Restricted Stock Units [Member]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 0.00%    
Maximum [Member] | Market Based Restricted Stock Units [Member]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 200.00%    
Maximum [Member] | Performance Based Restricted Stock Units [Member]      
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement 200.00%