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(Restricted Stock Rights) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Stock-based compensation expense [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 451.0    
Restricted Stock Units (RSUs) [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 394.0    
Restricted Stock Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 11.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 128.76 $ 110.05 $ 76.60
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 $ 300.0 $ 289.0 $ 320.0
Market Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 45.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 185.24 $ 140.93 $ 98.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 54.0 $ 48.0 $ 42.0
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 15.7    
Performance Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 12.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 67.00%    
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%