XML 110 R95.htm IDEA: XBRL DOCUMENT v3.8.0.1
(Restricted Stock Rights) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Stock-based compensation expense [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 504.0    
Restricted Stock Units (RSUs) [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 418.0    
Restricted Stock Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 12.3    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 2 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 $ 110.05 $ 76.60 $ 64.40
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 $ 289.0 $ 320.0 $ 372.0
Market Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 49.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 140.93 $ 98.04 $ 79.81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 48.0 $ 42.0 $ 47.0
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 17.7    
Performance Based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 37.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 110.51    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 104.00%    
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%