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Related Party Transactions - Schedule of Related Party Transactions with Key Management Personnel (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Key Management Personnel Stock Compensation Expense [Abstract]      
Salaries and other employee benefits to whole-time directors and executive officers $ 18 $ 19 $ 17
Commission and other benefits to non-executive / independent directors 2 1 1
Total compensation $ 20 $ 20 $ 18