Finance Receivables - Delinquency (Details) - Retail Finance Receivables - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Financing Receivable, Past Due [Line Items]
2022	$ 15,582	$ 27,638
2021	22,595	17,324
2020	13,784	7,084
2019	5,337	3,918
2018	2,732	1,607
Prior	1,179	522
Total	$ 61,208	$ 58,093	$ 56,357
Financing receivable not past due	100.00%	100.00%	100.00%
Performing Financial Instruments | 0 - 30 days
Financing Receivable, Past Due [Line Items]
2022	$ 15,468	$ 27,270
2021	22,088	16,945
2020	13,426	6,772
2019	5,076	3,721
2018	2,577	1,478
Prior	1,046	440
Total	$ 59,681	$ 56,626	$ 55,187
Financing receivable not past due	97.50%	97.50%	97.90%
Nonperforming Financial Instruments | 31 - 60 days
Financing Receivable, Past Due [Line Items]
2022	$ 88	$ 273
2021	369	276
2020	262	230
2019	193	147
2018	117	97
Prior	99	60
Total	$ 1,129	$ 1,083	$ 856
Financing receivable not past due	1.80%	1.80%	1.50%
Nonperforming Financial Instruments | Greater than 60 days
Financing Receivable, Past Due [Line Items]
2022	$ 23	$ 83
2021	118	93
2020	87	76
2019	62	46
2018	35	30
Prior	31	21
Total	$ 355	$ 349	$ 286
Financing receivable not past due	0.60%	0.60%	0.50%
Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent
Financing Receivable, Past Due [Line Items]
2022	$ 111	$ 356
2021	487	369
2020	350	306
2019	254	193
2018	152	127
Prior	130	81
Total	$ 1,484	$ 1,432	$ 1,142
Financing receivable not past due	2.40%	2.40%	2.00%
Nonperforming Financial Instruments | In repossession
Financing Receivable, Past Due [Line Items]
2022	$ 3	$ 12
2021	19	10
2020	9	6
2019	6	4
2018	3	2
Prior	3	1
Total	$ 43	$ 35	$ 28
Financing receivable not past due	0.10%	0.10%	0.10%
Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent or in repossession
Financing Receivable, Past Due [Line Items]
2022	$ 114	$ 368
2021	506	379
2020	358	312
2019	260	197
2018	155	129
Prior	133	82
Total	$ 1,527	$ 1,467	$ 1,170
Financing receivable not past due	2.50%	2.50%	2.10%