Investments in Operating Leases, Net - Investments in Operating Leases, Net (Parenthetical) (Details) - USD ($) $ in Billions	Dec. 31, 2024	Mar. 31, 2024
Securitized investments in operating leases [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Investments in operating leases	$ 11.9	$ 13.8

Amount, before accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant