Transfers of Receivables - Assets and Liabilities of Securitizations (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Securitization Transactions [Line Items]
Cash and cash equivalents	$ 8,848	$ 10,658
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	135,474		$ 123,827
Related Debt	129,258	129,287
Total assets	149,709	149,205	$ 138,932
Consolidated Entities [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	3,300	2,700
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	78,200	78,500
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	77,800	78,000
Related Debt	54,900	58,000
Consolidated Entities [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,800	2,200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	67,000	67,300
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	66,600	66,800
Related Debt	47,200	50,500
Consolidated Entities [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,000	2,000
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	45,000	46,000
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	44,600	45,500
Related Debt	38,100	38,500
Consolidated Entities [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	800	200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	22,000	21,300
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	22,000	21,300
Related Debt	9,100	12,000
Consolidated Entities [Member] | Securitization Transactions [Member] | Net Investment in Operating Leases [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	11,200	11,200
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	11,200	11,200
Related Debt	7,700	7,500
Variable Interest Entity, Primary Beneficiary [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,909	2,298
Related Debt	45,716	48,177
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,900	2,300
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	68,000	67,700
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	67,700	67,300
Related Debt	45,700	48,200
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,400	1,800
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	56,800	56,500
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	56,500	56,100
Related Debt	38,000	40,700
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	1,600	1,600
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	35,200	35,700
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	34,900	35,300
Related Debt	29,100	29,100
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	800	200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	21,600	20,800
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	21,600	20,800
Related Debt	8,900	11,600
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Net Investment in Operating Leases [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	11,200	11,200
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	11,200	11,200
Related Debt	7,700	7,500
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	400	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	10,200	10,800
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	10,100	10,700
Related Debt	9,200	9,800
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	400	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	10,200	10,800
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	10,100	10,700
Related Debt	9,200	9,800
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	400	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	9,800	10,300
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	9,700	10,200
Related Debt	9,000	9,400
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	0	0
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	400	500
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	400	500
Related Debt	200	400
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Net Investment in Operating Leases [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	0	0
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	0	0
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	0	0
Related Debt	$ 0	$ 0