Variable Interest Entities - Schedule of Assets and Liabilities related to Variable Interest Entities Securitization Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022
Variable Interest Entity [Line Items]
Restricted cash	$ 1,806	$ 2,065
Net securitized assets	89,294	82,432
Other assets	4,728	2,466
Debt	110,099	109,152
Other liabilities	5,675	6,224
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Restricted cash	1,806	1,929
Net securitized assets	25,758	20,932
Other assets	94	66
Debt	31,510	26,864
Other liabilities	45	10
Variable Interest Entity, Primary Beneficiary | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	38,323	32,818
Other assets	94	66
Variable Interest Entity, Primary Beneficiary | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	31,510	26,864
Other liabilities	45	10
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Restricted cash	1,211	1,284
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	25,758	20,932
Other assets	74	51
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	22,644	18,562
Other liabilities	31	8
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Restricted cash	595	645
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	12,565	11,886
Other assets	20	15
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	8,866	8,302
Other liabilities	$ 14	$ 2