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Share-Based Compensation - Summary of Options Outstanding (Details)
shares in Millions
12 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Number of Options Outstanding at Year End (in shares) | shares 2
Number of Options Exercisable at Year End (in shares) | shares 1
Range One  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices lower limit (in dollars per share) $ 118.41
Range of exercise prices upper limit (in dollars per share) $ 178.13
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) $ 148.36
Number of Options Exercisable at Year End (in shares) | shares 0
Weighted- Average Exercise Price (in dollars per share) $ 148.62
Range Two  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices lower limit (in dollars per share) 178.14
Range of exercise prices upper limit (in dollars per share) $ 237.86
Number of Options Outstanding at Year End (in shares) | shares 1
Weighted- Average Remaining Contractual Life (Years) 2 years
Weighted- Average Exercise Price (in dollars per share) $ 198.25
Number of Options Exercisable at Year End (in shares) | shares 1
Weighted- Average Exercise Price (in dollars per share) $ 199.88