Finance Receivables - Delinquency (Details) - Retail Finance Receivables - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Financing Receivable, Past Due [Line Items]
2022	$ 7,804	$ 27,638
2021	25,081	17,324
2020	15,531	7,084
2019	6,192	3,918
2018	3,296	1,607
Prior	1,599	522
Total	$ 59,503	$ 58,093	$ 53,397
Financing receivable not past due (percentage)	100.00%	100.00%	100.00%
Performing Financial Instruments | 0 - 30 days
Financing Receivable, Past Due [Line Items]
2022	$ 7,788	$ 27,270
2021	24,672	16,945
2020	15,197	6,772
2019	5,934	3,721
2018	3,139	1,478
Prior	1,448	440
Total	$ 58,179	$ 56,626	$ 52,367
Financing receivable not past due (percentage)	97.80%	97.50%	98.10%
Nonperforming Financial Instruments | 31 - 60 days
Financing Receivable, Past Due [Line Items]
2022	$ 15	$ 273
2021	298	276
2020	246	230
2019	192	147
2018	119	97
Prior	113	60
Total	$ 983	$ 1,083	$ 741
Financing receivable not past due (percentage)	1.70%	1.80%	1.40%
Nonperforming Financial Instruments | Greater than 60 days
Financing Receivable, Past Due [Line Items]
2022	$ 0	$ 83
2021	95	93
2020	79	76
2019	59	46
2018	34	30
Prior	34	21
Total	$ 302	$ 349	$ 257
Financing receivable not past due (percentage)	0.50%	0.60%	0.50%
Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent
Financing Receivable, Past Due [Line Items]
2022	$ 15	$ 356
2021	393	369
2020	325	306
2019	251	193
2018	153	127
Prior	148	81
Total	$ 1,285	$ 1,432	$ 998
Financing receivable not past due (percentage)	2.20%	2.40%	1.90%
Nonperforming Financial Instruments | In repossession
Financing Receivable, Past Due [Line Items]
2022	$ 0	$ 12
2021	16	10
2020	9	6
2019	7	4
2018	3	2
Prior	3	1
Total	$ 39	$ 35	$ 32
Financing receivable not past due (percentage)	0.10%	0.10%	0.00%
Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent or in repossession
Financing Receivable, Past Due [Line Items]
2022	$ 15	$ 368
2021	409	379
2020	334	312
2019	258	197
2018	157	129
Prior	150	82
Total	$ 1,324	$ 1,467	$ 1,030
Financing receivable not past due (percentage)	2.20%	2.50%	1.90%