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Investments in Operating Leases, Net - Investments in Operating Leases, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Property Subject To Or Available For Operating Lease [Line Items]    
Investments in operating leases, net $ 36,836 $ 37,091
Investments in operating leases [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Investments in operating leases 47,397 48,337
Investments In Operating Leases, Net [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Deferred origination (fees) and costs, net (56) (101)
Deferred income (1,488) (1,759)
Accumulated depreciation $ (9,017) $ (9,386)