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Share-Based Compensation - Summary of Options Outstanding (Details)
shares in Millions
12 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at Year End (in shares) | shares 3
Number of Options Exercisable at Year End (in shares) | shares 2
Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices lower limit (in dollars per share) $ 87.24
Range of exercise prices upper limit (in dollars per share) $ 162.55
Number of Options Outstanding at Year End (in shares) | shares 1
Weighted- Average Remaining Contractual Life (Years) 4 years
Weighted- Average Exercise Price (in dollars per share) $ 133.54
Number of Options Exercisable at Year End (in shares) | shares 1
Weighted- Average Exercise Price (in dollars per share) $ 119.65
Range Two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices lower limit (in dollars per share) 162.56
Range of exercise prices upper limit (in dollars per share) $ 239.93
Number of Options Outstanding at Year End (in shares) | shares 2
Weighted- Average Remaining Contractual Life (Years) 3 years
Weighted- Average Exercise Price (in dollars per share) $ 197.98
Number of Options Exercisable at Year End (in shares) | shares 1
Weighted- Average Exercise Price (in dollars per share) $ 199.08