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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Finance receivables from related party   $ 100 $ 109  
Derivative [Member] | Interest rate swaps [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value       $ 1
Gains included in net income $ 18      
Settlements $ 6