Finance Receivables, Net - Credit Quality Indicators (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
CY	$ 337	$ 1,140
CY - 1	1,058	1,005
CY - 2	901	680
CY - 3	574	337
CY - 4	262	116
Prior	80	20
Total	3,212	3,298
United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	81	308
CY - 1	294	288
CY - 2	262	207
CY - 3	178	110
CY - 4	88	45
Prior	32	9
Total	935	967
United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	108	341
CY - 1	320	273
CY - 2	247	159
CY - 3	133	67
CY - 4	53	16
Prior	10	0
Total	871	856
Canada
Financing Receivable, Credit Quality Indicator [Line Items]
CY	24	101
CY - 1	96	83
CY - 2	77	60
CY - 3	53	37
CY - 4	29	14
Prior	9	2
Total	288	297
Europe
Financing Receivable, Credit Quality Indicator [Line Items]
CY	124	390
CY - 1	348	361
CY - 2	315	254
CY - 3	210	123
CY - 4	92	41
Prior	29	9
Total	1,118	1,178
Low Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
CY	179	591
CY - 1	560	502
CY - 2	461	362
CY - 3	310	176
CY - 4	135	64
Prior	42	9
Total	1,687	1,704
Low Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	46	164
CY - 1	154	151
CY - 2	134	128
CY - 3	111	71
CY - 4	56	32
Prior	21	4
Total	522	550
Low Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	57	193
CY - 1	194	140
CY - 2	140	79
CY - 3	69	33
CY - 4	26	7
Prior	4	0
Total	490	452
Low Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
CY	11	37
CY - 1	36	34
CY - 2	31	24
CY - 3	21	10
CY - 4	7	5
Prior	3	1
Total	109	111
Low Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
CY	65	197
CY - 1	176	177
CY - 2	156	131
CY - 3	109	62
CY - 4	46	20
Prior	14	4
Total	566	591
Average Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
CY	121	399
CY - 1	360	418
CY - 2	362	257
CY - 3	211	125
CY - 4	97	39
Prior	27	7
Total	1,178	1,245
Average Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	17	54
CY - 1	53	95
CY - 2	89	52
CY - 3	43	26
CY - 4	20	8
Prior	6	2
Total	228	237
Average Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	42	129
CY - 1	110	124
CY - 2	99	71
CY - 3	56	31
CY - 4	24	8
Prior	5	0
Total	336	363
Average Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
CY	10	46
CY - 1	44	39
CY - 2	36	26
CY - 3	23	17
CY - 4	15	6
Prior	4	1
Total	132	135
Average Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
CY	52	170
CY - 1	153	160
CY - 2	138	108
CY - 3	89	51
CY - 4	38	17
Prior	12	4
Total	482	510
High Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
CY	37	150
CY - 1	138	85
CY - 2	78	61
CY - 3	53	36
CY - 4	30	13
Prior	11	4
Total	347	349
High Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	18	90
CY - 1	87	42
CY - 2	39	27
CY - 3	24	13
CY - 4	12	5
Prior	5	3
Total	185	180
High Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
CY	9	19
CY - 1	16	9
CY - 2	8	9
CY - 3	8	3
CY - 4	3	1
Prior	1	0
Total	45	41
High Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
CY	3	18
CY - 1	16	10
CY - 2	10	10
CY - 3	9	10
CY - 4	7	3
Prior	2	0
Total	47	51
High Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
CY	7	23
CY - 1	19	24
CY - 2	21	15
CY - 3	12	10
CY - 4	8	4
Prior	3	1
Total	$ 70	$ 77