Finance Receivables - Credit Quality and Impaired Receivables (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 122,814,000,000	$ 113,705,000,000
Finance receivables before unearned interest supplements	8,357,000,000	7,793,000,000
Related Party Transaction, Expenses from Transactions with Related Party	(437,000,000)	(408,000,000)
Finance receivables, net	7,881,000,000	7,347,000,000
Sales-type Lease, Interest Income, Unguaranteed Residual Asset	2,883,000,000	2,910,000,000
Deferred Costs, Leasing, Gross	107,000,000	96,000,000
Sales-Type and Direct Financing Lease, Gross	5,367,000,000	4,787,000,000
Sales Type and Direct Financing Lease Revenue	$ 515,000,000	381,000,000	$ 303,000,000
Non-Accrual of Revenue	90
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	$ (39,000,000)	(38,000,000)
Wholesale and Dealer Loans [Member] | Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	8,000,000	33,000,000
Consumer Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	83,332,000,000	78,392,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	846,000,000	947,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,282,000,000	2,424,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,604,000,000	7,562,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,542,000,000	11,497,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	24,513,000,000	20,536,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	36,545,000,000	35,426,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	46,000,000	47,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	58,000,000	40,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	71,000,000	75,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	152,000,000	85,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	191,000,000	117,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	50,000,000	37,000,000
Consumer Segment [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1.000	1.000
Consumer Segment [Member] | 31-60 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	872,000,000	690,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	43,000,000	40,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	93,000,000	49,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	104,000,000	130,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	187,000,000	125,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	242,000,000	187,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	203,000,000	159,000,000
Consumer Segment [Member] | 31-60 Days Past Due [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.010	0.009
Consumer Segment [Member] | Financing Receivables, 61-120 Days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	225,000,000	195,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,000,000	9,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	20,000,000	11,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	27,000,000	30,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	46,000,000	37,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	70,000,000	58,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	54,000,000	50,000,000
Consumer Segment [Member] | Financing Receivables, 61-120 Days past due [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.003	0.002
Consumer Segment [Member] | Greater Than 120 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	50,000,000	43,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,000,000	7,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,000,000	4,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,000,000	7,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11,000,000	10,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,000,000	10,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	5,000,000	5,000,000
Consumer Segment [Member] | Greater Than 120 Days Past Due [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.001	0.001
Consumer Segment [Member] | Total past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,147,000,000	928,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	58,000,000	56,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	120,000,000	64,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	139,000,000	167,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	244,000,000	172,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	324,000,000	255,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	262,000,000	214,000,000
Consumer Segment [Member] | Total past due [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.014	0.012
Consumer Segment [Member] | Financial Asset, 1 to 29 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	82,185,000,000	77,464,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	788,000,000	891,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,162,000,000	2,360,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,465,000,000	7,395,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,298,000,000	11,325,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	24,189,000,000	20,281,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	36,283,000,000	35,212,000,000
Consumer Segment [Member] | Financial Asset, 1 to 29 Days Past Due [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 0.986	0.988
Consumer Segment [Member] | Pass [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	60 days
Consumer Segment [Member] | Substandard [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	120 days
Consumer Segment [Member] | Special Mention | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	61 days
Consumer Segment [Member] | Special Mention | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	120 days
Non-Consumer Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 39,482,000,000	35,313,000,000
Financing Receivable, Revolving	36,347,000,000	32,262,000,000
Financing Receivable, Revolving, Writeoff	6,000,000	3,000,000
Non-Consumer Segment [Member] | Group I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	34,298,000,000	30,132,000,000
Financing Receivable, Revolving	33,345,000,000	29,095,000,000
Non-Consumer Segment [Member] | Group I [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.917	0.903
Non-Consumer Segment [Member] | Group II [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	2,570,000,000	2,900,000,000
Financing Receivable, Revolving	2,494,000,000	2,834,000,000
Non-Consumer Segment [Member] | Group II [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.069	0.087
Non-Consumer Segment [Member] | Group III [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	469,000,000	301,000,000
Financing Receivable, Revolving	462,000,000	292,000,000
Non-Consumer Segment [Member] | Group III [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.013	0.009
Non-Consumer Segment [Member] | Group IV [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	47,000,000	44,000,000
Financing Receivable, Revolving	46,000,000	41,000,000
Non-Consumer Segment [Member] | Group IV [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	0.001	0.001
Non-Consumer Segment [Member] | Dealer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	283,000,000	399,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	63,000,000	31,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	102,000,000	59,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	48,000,000	159,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	260,000,000	64,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	281,000,000	403,000,000
Financing Receivable Total	1,037,000,000	1,115,000,000
Non-Consumer Segment [Member] | Dealer Loan | Group I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	270,000,000	383,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	63,000,000	30,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	97,000,000	58,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	47,000,000	156,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	231,000,000	61,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	245,000,000	349,000,000
Financing Receivable Total	953,000,000	1,037,000,000
Non-Consumer Segment [Member] | Dealer Loan | Group II [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,000,000	16,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,000,000	1,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,000,000	3,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	28,000,000	2,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	31,000,000	44,000,000
Financing Receivable Total	76,000,000	66,000,000
Non-Consumer Segment [Member] | Dealer Loan | Group III [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,000,000	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,000,000	1,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	4,000,000	8,000,000
Financing Receivable Total	7,000,000	9,000,000
Non-Consumer Segment [Member] | Dealer Loan | Group IV [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	1,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,000,000	2,000,000
Financing Receivable Total	1,000,000	3,000,000
Non-Consumer Segment [Member] | Non-Consumer Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	37,384,000,000	33,377,000,000
Non-Consumer Segment [Member] | Non-Consumer Segment [Member] | Percent of Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1.000	1.000
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	37,384,000,000	33,377,000,000
Financing Receivable, Allowance for Credit Loss, Write off	7,000,000	4,000,000
Non-Consumer Segment [Member] | Dealer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	1,000,000	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	1,000,000
Financing Receivable, Allowance for Credit Loss, Write off	$ 1,000,000	$ 1,000,000