Finance Receivables - Aging Analysis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	$ 101,358	$ 93,275
Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	71,503	73,545
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	942	868
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,640	2,676
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,265	6,692
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	14,091	12,875
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,579	22,967
Financing Receivable, Year One, Originated, Current Fiscal Year	28,986	27,467
Non-Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	29,855	19,730
Financing Receivable, Revolving	27,261	16,944
Non-Consumer Segment [Member] | Dealer Loan
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	404	410
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	169	75
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	36	182
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	72	47
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	187	114
Financing Receivable, Year One, Originated, Current Fiscal Year	279	425
Non-Consumer Segment [Member] | Group I [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	25,303	14,779
Financing Receivable, Revolving	24,242	13,670
Non-Consumer Segment [Member] | Group I [Member] | Dealer Loan
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	402	391
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	148	68
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	35	151
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	67	45
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	185	109
Financing Receivable, Year One, Originated, Current Fiscal Year	224	345
Non-Consumer Segment [Member] | Group II [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	2,823	2,793
Financing Receivable, Revolving	2,751	2,689
Non-Consumer Segment [Member] | Group II [Member] | Dealer Loan
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2	11
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	21	7
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	26
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	5	2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2	4
Financing Receivable, Year One, Originated, Current Fiscal Year	42	54
Non-Consumer Segment [Member] | Group III [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	243	559
Financing Receivable, Revolving	233	529
Non-Consumer Segment [Member] | Group III [Member] | Dealer Loan
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	8
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	1
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	1
Financing Receivable, Year One, Originated, Current Fiscal Year	10	20
Non-Consumer Segment [Member] | Group IV [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	39	66
Financing Receivable, Revolving	35	56
Non-Consumer Segment [Member] | Group IV [Member] | Dealer Loan
Finance Receivables Aging Analysis [Abstract]
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	1	4
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	3	6
Financial Asset, 1 to 29 Days Past Due [Member] | Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	70,667	72,789
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	883	812
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,564	2,608
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,149	6,568
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	13,864	12,717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,382	22,730
Financing Receivable, Year One, Originated, Current Fiscal Year	28,825	27,354
31-60 Days Past Due [Member] | Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	649	586
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	41	39
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	60	52
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	91	98
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	181	120
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	150	186
Financing Receivable, Year One, Originated, Current Fiscal Year	126	91
Financing Receivables, 61-120 Days past due [Member] | Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	149	127
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9	7
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	12	10
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	20	20
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	39	29
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	40	40
Financing Receivable, Year One, Originated, Current Fiscal Year	29	21
Greater Than 120 Days Past Due [Member] | Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	38	43
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9	10
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4	6
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5	6
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7	9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7	11
Financing Receivable, Year One, Originated, Current Fiscal Year	6	1
Total past due [Member] | Consumer Segment [Member]
Finance Receivables Aging Analysis [Abstract]
Financing Receivable, Gross	836	756
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	59	56
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	76	68
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	116	124
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	227	158
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	197	237
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 161	$ 113