Variable Interest Entities - Schedule of Assets and Liabilities related to Variable Interest Entities Securitization Transactions (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022
Variable Interest Entity [Line Items]
Restricted cash	$ 2,090	$ 2,065
Net securitized assets	90,280	82,432
Other assets	3,921	2,466
Debt	111,685	109,152
Other liabilities	5,674	6,224
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	2,090	1,929
Net securitized assets	28,764	20,932
Other assets	108	66
Debt	32,736	26,864
Other liabilities	51	10
Other assets [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net securitized assets	39,827	32,818
Other assets	108	66
Other liabilities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Debt	32,736	26,864
Other liabilities	51	10
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	1,434	1,284
Retail Finance Receivables [Member] | Other assets [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net securitized assets	28,764	20,932
Other assets	85	51
Retail Finance Receivables [Member] | Other liabilities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Debt	25,155	18,562
Other liabilities	41	8
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	656	645
Investments In Operating Leases, Net [Member] | Other assets [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net securitized assets	11,063	11,886
Other assets	23	15
Investments In Operating Leases, Net [Member] | Other liabilities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Debt	7,581	8,302
Other liabilities	$ 10	$ 2