Finance Receivables - Contractual Maturities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	$ 101,358,000,000	$ 93,275,000,000
Finance receivables before unearned interest supplements	6,765,000,000	7,318,000,000
Consumer Segment [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	71,503,000,000	73,545,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,640,000,000	2,676,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,265,000,000	6,692,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	14,091,000,000	12,875,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,579,000,000	22,967,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	28,986,000,000	27,467,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	942,000,000	868,000,000
Consumer Segment [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	1.000	1.000
Consumer Segment [Member] | 31-60 Days Past Due [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	649,000,000	586,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	60,000,000	52,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	91,000,000	98,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	181,000,000	120,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	150,000,000	186,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	126,000,000	91,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	41,000,000	39,000,000
Consumer Segment [Member] | 31-60 Days Past Due [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	0.009	0.008
Consumer Segment [Member] | Financing Receivables, 61-120 Days past due [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	149,000,000	127,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	12,000,000	10,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	20,000,000	20,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	39,000,000	29,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	40,000,000	40,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	29,000,000	21,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,000,000	7,000,000
Consumer Segment [Member] | Financing Receivables, 61-120 Days past due [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	0.002	0.002
Consumer Segment [Member] | Greater Than 120 Days Past Due [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	38,000,000	43,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,000,000	6,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,000,000	6,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,000,000	9,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,000,000	11,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	6,000,000	1,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,000,000	10,000,000
Consumer Segment [Member] | Greater Than 120 Days Past Due [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	0.001	0
Consumer Segment [Member] | Total past due [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	836,000,000	756,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	76,000,000	68,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	116,000,000	124,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	227,000,000	158,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	197,000,000	237,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	161,000,000	113,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	59,000,000	56,000,000
Consumer Segment [Member] | Total past due [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	0.012	0.010
Consumer Segment [Member] | Financial Asset, 1 to 29 Days Past Due [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	70,667,000,000	72,789,000,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,564,000,000	2,608,000,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,149,000,000	6,568,000,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	13,864,000,000	12,717,000,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,382,000,000	22,730,000,000
Financing Receivable, Year One, Originated, Current Fiscal Year	28,825,000,000	27,354,000,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	883,000,000	812,000,000
Consumer Segment [Member] | Financial Asset, 1 to 29 Days Past Due [Member] | Percent of Total
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	0.988	0.990
Consumer Segment [Member] | Retail [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	71,503,000,000	73,545,000,000
Finance receivables before unearned interest supplements	73,808,000,000	76,565,000,000
Non-Consumer Segment [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	29,855,000,000	19,730,000,000
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	28,408,000,000	18,197,000,000
Non-Consumer Segment [Member] | Other Finance Receivables [Member]
Finance Receivables Maturity [Abstract]
Financing Receivable, Gross	$ 1,447,000,000	$ 1,533,000,000