Investment in Operating Leases - Schedule of Operating Lease Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Lease payments	$ 1,371	$ 1,447	$ 4,155	$ 4,562
Subsidy income and dealer rate participation, net	125	131	376	434
Reimbursed lessor costs	8	10	40	47
Total operating lease revenue, net	$ 1,504	$ 1,588	$ 4,571	$ 5,043