Transfers of Receivables - Assets and Liabilities of Securitizations (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Securitization Transactions [Line Items]
Cash and cash equivalents	$ 7,451	$ 9,272
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	141,555		$ 135,474
Related Debt	134,340	137,868
Total assets	154,923	158,292	$ 149,709
Consolidated Entities [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,900	3,000
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	79,600	85,300
Allowance for Credit Losses	(400)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	79,200	84,900
Related Debt	52,800	60,400
Consolidated Entities [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,300	2,500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	66,400	72,000
Allowance for Credit Losses	(400)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	66,000	71,600
Related Debt	44,200	51,900
Consolidated Entities [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,100	2,200
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	43,900	47,600
Allowance for Credit Losses	(400)	(400)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	43,500	47,200
Related Debt	37,400	40,900
Consolidated Entities [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	200	300
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	22,500	24,400
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	22,500	24,400
Related Debt	6,800	11,000
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	13,200	13,300
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	13,200	13,300
Related Debt	8,600	8,500
Variable Interest Entity, Primary Beneficiary [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,404	2,494
Related Debt	44,368	50,855
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	2,400	2,500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	69,900	74,300
Allowance for Credit Losses	(300)	(300)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	69,600	74,000
Related Debt	44,400	50,900
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	1,800	2,000
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	56,700	61,000
Allowance for Credit Losses	(300)	(300)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	56,400	60,700
Related Debt	35,800	42,400
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	1,600	1,700
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	34,500	37,000
Allowance for Credit Losses	(300)	(300)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	34,200	36,700
Related Debt	29,200	31,600
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member] | Wholesale [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	200	300
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	22,200	24,000
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	22,200	24,000
Related Debt	6,600	10,800
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	13,200	13,300
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	13,200	13,300
Related Debt	8,600	8,500
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	9,700	11,000
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	9,600	10,900
Related Debt	8,400	9,500
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Financing Receivable [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	9,700	11,000
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	9,600	10,900
Related Debt	8,400	9,500
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Securitization Transactions [Member] | Retail [Member]
Securitization Transactions [Line Items]
Cash and cash equivalents	500	500
Finance Receivables and Net Investment in Operating Leases, Before Allowance for Credit Losses	9,400	10,600
Allowance for Credit Losses	(100)	(100)
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	9,300	10,500
Related Debt	8,200	9,300
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	300	400
Allowance for Credit Losses	0	0
Finance Receivables and Net Investment In Operating Leases, After Allowance for Credit Losses	300	400
Related Debt	200	200
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