Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) $ in Millions	Mar. 31, 2021 USD ($)
Financing Receivable, Recorded Investment [Line Items]
2021	$ 2,400
2020	703
2019	805
2018	431
2017	455
2016 and Prior	1,804
Revolving loans	7,044
Total	13,642
Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	32,228
2020	16,249
2019	9,127
2018	6,090
2017	2,497
2016 and Prior	537
Total	66,728
Current [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	32,026
2020	16,047
2019	8,972
2018	5,977
2017	2,435
2016 and Prior	496
Total	65,953
30-59 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	147
2020	145
2019	114
2018	83
2017	46
2016 and Prior	27
Total	562
60-89 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	37
2020	39
2019	28
2018	21
2017	11
2016 and Prior	8
Total	144
90 Days or Greater Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	18
2020	18
2019	13
2018	9
2017	5
2016 and Prior	6
Total	69
Wholesale [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
2016 and Prior	0
Revolving loans	6,157
Total	6,157
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	5,893
Total	5,893
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	218
Total	218
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	35
Total	35
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	11
Total	11
Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1,895
2020	369
2019	599
2018	389
2017	342
2016 and Prior	1,609
Revolving loans	0
Total	5,203
Real estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1,874
2020	320
2019	596
2018	356
2017	312
2016 and Prior	1,493
Revolving loans	0
Total	4,951
Real estate [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	8
2020	49
2019	3
2018	20
2017	9
2016 and Prior	99
Revolving loans	0
Total	188
Real estate [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	13
2020	0
2019	0
2018	0
2017	12
2016 and Prior	17
Revolving loans	0
Total	42
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	505
2020	334
2019	206
2018	42
2017	113
2016 and Prior	195
Revolving loans	887
Total	2,282
Working capital [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	503
2020	334
2019	200
2018	41
2017	106
2016 and Prior	176
Revolving loans	878
Total	2,238
Working capital [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1
2020	0
2019	6
2018	1
2017	0
2016 and Prior	19
Revolving loans	9
Total	36
Working capital [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
2021	1
2020	0
2019	0
2018	0
2017	7
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