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(Restricted Stock Rights) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Restricted Stock Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 17.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 275.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 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 $ 76.60 $ 64.40 $ 37.22
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 $ 320.0 $ 372.0 $ 209.0
Market Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 35.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 98.04 $ 79.81 $ 48.14
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 42.0 $ 47.0 $ 23.0
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Grants | shares 0.7    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Max, Outstanding | shares 1.3    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 24.3    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 2.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 months    
Minimum [Member] | Market 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%    
Target [Member] | Market Based Restricted Stock Units [Member]      
Target percentage of presented shares granted that may potentially vest 100.00%