Investments in Operating Leases, Net - Investments in Operating Leases, Net (Details) - USD ($) $ in Millions		Dec. 31, 2025	Mar. 31, 2025
Property Subject To Or Available For Operating Lease [Line Items]
Investments in operating leases, net		$ 31,051	$ 30,090
Investments in operating leases [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Investments in operating leases	[1]	37,739	36,523
Investments In Operating Leases, Net [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Deferred income		(774)	(955)
Accumulated depreciation		$ (5,914)	$ (5,478)

[1] Includes gross securitized investments in operating leases of $12.9 billion and $13.6 billion as of December 31, 2025 and March 31, 2025, respectively.