Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) $ in Millions	Dec. 31, 2020 USD ($)
Financing Receivable, Recorded Investment [Line Items]
2021	$ 2,037
2020	774
2019	828
2018	466
2017	503
2016 and Prior	1,992
Revolving loans	8,612
Total	15,212
Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	25,086
2020	18,066
2019	10,413
2018	7,144
2017	3,225
2016 and Prior	816
Total	64,750
Current [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	24,905
2020	17,763
2019	10,165
2018	6,963
2017	3,117
2016 and Prior	744
Total	63,657
30-59 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	137
2020	215
2019	177
2018	132
2017	78
2016 and Prior	50
Total	789
60-89 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	32
2020	62
2019	52
2018	36
2017	22
2016 and Prior	15
Total	219
90 Days or Greater Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	12
2020	26
2019	19
2018	13
2017	8
2016 and Prior	7
Total	85
Wholesale [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	7,457
Total	7,457
Wholesale [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	7,133
Total	7,133
Wholesale [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	275
Total	275
Wholesale [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	34
Total	34
Wholesale [Member] | Default [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	15
Total	15
Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1,619
2020	404
2019	608
2018	419
2017	381
2016 and Prior	1,776
Revolving loans	0
Total	5,207
Real estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1,571
2020	355
2019	601
2018	386
2017	358
2016 and Prior	1,652
Revolving loans	0
Total	4,923
Real estate [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	34
2020	49
2019	7
2018	20
2017	9
2016 and Prior	107
Revolving loans	0
Total	226
Real estate [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	14
2020	0
2019	0
2018	0
2017	5
2016 and Prior	17
Revolving loans	0
Total	36
Real estate [Member] | Default [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	13
2017	9
2016 and Prior	0
Revolving loans	0
Total	22
Working capital [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	418
2020	370
2019	220
2018	47
2017	122
2016 and Prior	216
Revolving loans	1,155
Total	2,548
Working capital [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	412
2020	346
2019	206
2018	47
2017	114
2016 and Prior	197
Revolving loans	1,154
Total	2,476
Working capital [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	6
2020	24
2019	14
2018	0
2017	0
2016 and Prior	19
Revolving loans	1
Total	64
Working capital [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	8
2016 and Prior	0
Revolving loans	0
Total	8
Working capital [Member] | Default [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	0
Total	$ 0