Variable Interest Entities - Schedule of Assets and Liabilities related to Variable Interest Entities Securitization Transactions (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023
Variable Interest Entity [Line Items]
Restricted cash	$ 1,978	$ 2,090
Net securitized assets	93,162	90,280
Other assets	3,798	3,921
Debt	112,376	111,685
Other liabilities	5,925	5,674
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	1,978	2,090
Net securitized assets	27,778	28,764
Other assets	105	108
Debt	31,464	32,736
Other liabilities	53	51
Variable Interest Entity, Primary Beneficiary [Member] | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	38,314	39,827
Other assets	105	108
Variable Interest Entity, Primary Beneficiary [Member] | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	31,464	32,736
Other liabilities	53	51
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	1,359	1,434
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	27,778	28,764
Other assets	83	85
Retail Finance Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	24,315	25,155
Other liabilities	43	41
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	619	656
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Other assets [Member]
Variable Interest Entity [Line Items]
Net securitized assets	10,536	11,063
Other assets	22	23
Investments In Operating Leases, Net [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Other liabilities [Member]
Variable Interest Entity [Line Items]
Debt	7,149	7,581
Other liabilities	$ 10	$ 10