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Share-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Shares      
Beginning balance (in shares) 2,000,000    
Granted (in shares) 0 0 0
Cancelled (in shares) 0    
Exercised (in shares) (1,000,000)    
Ending balance (in shares) 1,000,000 2,000,000  
Weighted- Average Exercise Price      
Beginning balance (in dollars per share) $ 183.29    
Granted (in dollars per share) 0    
Cancelled (in dollars per share) 207.92    
Exercised (in dollars per share) 190.96    
Ending balance (in dollars per share) $ 175.23 $ 183.29  
Weighted- Average Remaining Contractual Term (Years)      
Stock options outstanding, remaining contractual term 2 years 2 years  
Stock options outstanding, aggregate intrinsic value $ 114 $ 36  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Stock options vested and expected to vest (in shares) 1,000,000    
Stock options vested and exercisable (in shares) 1,000,000    
Stock options vested and expected to vest, weighted average exercise price (in dollars per share) $ 175.23    
Stock options vested and exercisable, weighted average exercise price (in dollars per share) $ 178.48    
Stock options vested and expected to vest, weighted average remaining contractual term 2 years    
Stock options vested and exercisable, weighted average remaining contractual term 2 years    
Stock options vested and expected to vest, aggregate intrinsic value $ 114    
Stock options vested and exercisable, aggregate intrinsic value $ 101