Finance Receivables, Net - Credit Quality Indicators (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 798
2019	1,066
2018	757
2017	404
2016	164
Prior	29
Subtotal	3,218	$ 3,440
United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	224
2019	310
2018	233
2017	134
2016	66
Prior	13
Subtotal	980	1,103
United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	253
2019	296
2018	181
2017	83
2016	24
Prior	2
Subtotal	839	819
Canada
Financing Receivable, Credit Quality Indicator [Line Items]
2020	69
2019	85
2018	65
2017	43
2016	19
Prior	3
Subtotal	284	326
Europe
Financing Receivable, Credit Quality Indicator [Line Items]
2020	252
2019	375
2018	278
2017	144
2016	55
Prior	11
Subtotal	1,115	1,192
Low Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2020	423
2019	563
2018	418
2017	216
2016	99
Prior	16
Subtotal	1,735	1,716
Low Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	117
2019	160
2018	144
2017	87
2016	48
Prior	7
Subtotal	563	640
Low Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	154
2019	180
2018	103
2017	45
2016	14
Prior	1
Subtotal	497	258
Low Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24
2019	34
2018	26
2017	11
2016	8
Prior	2
Subtotal	105	163
Low Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
2020	128
2019	189
2018	145
2017	73
2016	29
Prior	6
Subtotal	570	655
Average Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2020	268
2019	417
2018	279
2017	146
2016	51
Prior	9
Subtotal	1,170	1,352
Average Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	42
2019	103
2018	60
2017	31
2016	12
Prior	3
Subtotal	251	331
Average Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	86
2019	110
2018	73
2017	35
2016	9
Prior	1
Subtotal	314	445
Average Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
2020	32
2019	40
2018	29
2017	20
2016	8
Prior	1
Subtotal	130	97
Average Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
2020	108
2019	164
2018	117
2017	60
2016	22
Prior	4
Subtotal	475	479
High Credit Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2020	107
2019	86
2018	60
2017	42
2016	14
Prior	4
Subtotal	313	372
High Credit Risk | United States (Direct):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	65
2019	47
2018	29
2017	16
2016	6
Prior	3
Subtotal	166	132
High Credit Risk | United States (Indirect):
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13
2019	6
2018	5
2017	3
2016	1
Prior	0
Subtotal	28	116
High Credit Risk | Canada
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13
2019	11
2018	10
2017	12
2016	3
Prior	0
Subtotal	49	66
High Credit Risk | Europe
Financing Receivable, Credit Quality Indicator [Line Items]
2020	16
2019	22
2018	16
2017	11
2016	4
Prior	1
Subtotal	$ 70	$ 58