Finance Receivables - Delinquency (Details) - Retail Finance Receivables - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
2021	$ 27,638	$ 26,183
2020	17,324	12,050
2019	7,084	7,463
2018	3,918	3,693
2017	1,607	1,390
Prior	522	509
Total	$ 58,093	$ 51,288
Financing receivable past due (percent)	100.00%	100.00%
0 - 30 days | Performing Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 27,270	$ 25,894
2020	16,945	11,591
2019	6,772	7,131
2018	3,721	3,454
2017	1,478	1,249
Prior	440	421
Total	$ 56,626	$ 49,740
Financing receivable past due (percent)	97.50%	97.00%
31 - 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 273	$ 210
2020	276	325
2019	230	235
2018	147	170
2017	97	102
Prior	60	61
Total	$ 1,083	$ 1,103
Financing receivable past due (percent)	1.80%	2.10%
Greater than 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 83	$ 72
2020	93	123
2019	76	90
2018	46	64
2017	30	37
Prior	21	26
Total	$ 349	$ 412
Financing receivable past due (percent)	0.60%	0.80%
Finance receivables more than 30 days delinquent | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 356	$ 282
2020	369	448
2019	306	325
2018	193	234
2017	127	139
Prior	81	87
Total	$ 1,432	$ 1,515
Financing receivable past due (percent)	2.40%	2.90%
In repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 12	$ 7
2020	10	11
2019	6	7
2018	4	5
2017	2	2
Prior	1	1
Total	$ 35	$ 33
Financing receivable past due (percent)	0.10%	0.10%
Finance receivables more than 30 days delinquent or in repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2021	$ 368	$ 289
2020	379	459
2019	312	332
2018	197	239
2017	129	141
Prior	82	88
Total	$ 1,467	$ 1,548
Financing receivable past due (percent)	2.50%	3.00%