Transfers of Receivables - Assets and Liabilities of Securitizations (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Securitization Transactions [Line Items]
Cash and cash equivalents	$ 8,471	$ 10,658
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	142,207		$ 126,327
Related Debt	136,661	129,287
Total assets	157,056	149,205	$ 143,551
Consolidated Entities [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	3,000	2,700
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	85,700	78,500
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	85,300	78,000
Related Debt	56,300	58,000
Consolidated Entities [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,400	2,200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	72,400	67,300
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	72,000	66,800
Related Debt	47,600	50,500
Consolidated Entities [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,200	2,000
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	48,700	46,000
Allowance for Credit Losses	(400)	(500)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	48,300	45,500
Related Debt	41,200	38,500
Consolidated Entities [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	200	200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	23,700	21,300
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	23,700	21,300
Related Debt	6,400	12,000
Consolidated Entities [Member] | Securitization Transactions [Member] | Net Investment in Operating Leases [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	600	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	13,300	11,200
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	13,300	11,200
Related Debt	8,700	7,500
Variable Interest Entity, Primary Beneficiary [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,526	2,298
Related Debt	46,170	48,177
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,500	2,300
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	74,000	67,700
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	73,700	67,300
Related Debt	46,200	48,200
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	1,900	1,800
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	60,700	56,500
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	60,400	56,100
Related Debt	37,500	40,700
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	1,700	1,600
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	37,400	35,700
Allowance for Credit Losses	(300)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	37,100	35,300
Related Debt	31,400	29,100
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	200	200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	23,300	20,800
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	23,300	20,800
Related Debt	6,100	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	600	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	13,300	11,200
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	13,300	11,200
Related Debt	8,700	7,500
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	11,700	10,800
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	11,600	10,700
Related Debt	10,100	9,800
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	11,700	10,800
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	11,600	10,700
Related Debt	10,100	9,800
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	400
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	11,300	10,300
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	11,200	10,200
Related Debt	9,800	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	300	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