Finance Receivables - Delinquency (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Charge-offs
2023			$ 9
2022			222
2021			205
2020			101
2019			59
Prior			49
Total			645
Retail Finance Receivables
Financing Receivable, Past Due [Line Items]
2023	$ 16,636		16,636		$ 29,090
2022	24,419		24,419		18,745
2021	15,558		15,558		11,081
2020	8,830		8,830		3,992
2019	2,909		2,909		1,824
Prior	1,369		1,369		589
Total	$ 69,722	$ 61,208	$ 69,722	$ 61,208	$ 65,322
Percent of portfolio	100.00%	100.00%	100.00%	100.00%	100.00%
Charge-offs
Total	$ 323	$ 247	$ 645	$ 521
Retail Finance Receivables | Performing Financial Instruments | 0 - 30 days
Financing Receivable, Past Due [Line Items]
2023	16,532		16,532		$ 28,676
2022	23,898		23,898		18,128
2021	15,039		15,039		10,702
2020	8,533		8,533		3,743
2019	2,726		2,726		1,685
Prior	1,229		1,229		493
Total	$ 67,957	$ 59,681	$ 67,957	$ 59,681	$ 63,426
Percent of portfolio	97.50%	97.50%	97.50%	97.50%	97.10%
Retail Finance Receivables | Nonperforming Financial Instruments | 31 - 60 days
Financing Receivable, Past Due [Line Items]
2023	$ 79		$ 79		$ 310
2022	368		368		452
2021	377		377		275
2020	218		218		184
2019	137		137		103
Prior	105		105		69
Total	$ 1,284	$ 1,129	$ 1,284	$ 1,129	$ 1,393
Percent of portfolio	1.80%	1.80%	1.80%	1.80%	2.10%
Retail Finance Receivables | Nonperforming Financial Instruments | Greater than 60 days
Financing Receivable, Past Due [Line Items]
2023	$ 22		$ 22		$ 93
2022	133		133		150
2021	126		126		98
2020	73		73		62
2019	43		43		35
Prior	34		34		26
Total	$ 430	$ 355	$ 430	$ 355	$ 465
Percent of portfolio	0.60%	0.60%	0.60%	0.60%	0.70%
Retail Finance Receivables | Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent
Financing Receivable, Past Due [Line Items]
2023	$ 101		$ 101		$ 403
2022	501		501		603
2021	503		503		373
2020	291		291		246
2019	180		180		138
Prior	139		139		95
Total	$ 1,714	$ 1,484	$ 1,714	$ 1,484	$ 1,857
Percent of portfolio	2.50%	2.40%	2.50%	2.40%	2.80%
Retail Finance Receivables | Nonperforming Financial Instruments | In repossession
Financing Receivable, Past Due [Line Items]
2023	$ 4		$ 4		$ 11
2022	19		19		14
2021	16		16		6
2020	6		6		4
2019	3		3		2
Prior	2		2		1
Total	$ 51	$ 43	$ 51	$ 43	$ 39
Percent of portfolio	0.10%	0.10%	0.10%	0.10%	0.10%
Retail Finance Receivables | Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent or in repossession
Financing Receivable, Past Due [Line Items]
2023	$ 105		$ 105		$ 414
2022	521		521		617
2021	518		518		380
2020	298		298		249
2019	183		183		140
Prior	141		141		96
Total	$ 1,765	$ 1,527	$ 1,765	$ 1,527	$ 1,896
Percent of portfolio	2.50%	2.50%	2.50%	2.50%	2.90%