Finance Receivables - Delinquency (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Charge-offs for the three months ended March 31, 2023
2023	$ 0
2022	102
2021	108
2020	52
2019	32
Prior	28
Total	322
Retail Finance Receivables
Financing Receivable, Past Due [Line Items]
2023	8,663		$ 29,090
2022	26,699		18,745
2021	17,138		11,081
2020	9,936		3,992
2019	3,429		1,824
Prior	1,839		589
Total	$ 67,704	$ 59,503	$ 65,322
Percent of portfolio	100.00%	100.00%	100.00%
Charge-offs for the three months ended March 31, 2023
Total	$ 322	$ 275
Retail Finance Receivables | Performing Financial Instruments | 0 - 30 days
Financing Receivable, Past Due [Line Items]
2023	8,646		$ 28,676
2022	26,262		18,128
2021	16,648		10,702
2020	9,640		3,743
2019	3,236		1,685
Prior	1,676		493
Total	$ 66,109	$ 58,179	$ 63,426
Percent of portfolio	97.60%	97.80%	97.10%
Retail Finance Receivables | Nonperforming Financial Instruments | 31 - 60 days
Financing Receivable, Past Due [Line Items]
2023	$ 17		$ 310
2022	316		452
2021	363		275
2020	222		184
2019	146		103
Prior	124		69
Total	$ 1,188	$ 983	$ 1,393
Percent of portfolio	1.80%	1.70%	2.10%
Retail Finance Receivables | Nonperforming Financial Instruments | Greater than 60 days
Financing Receivable, Past Due [Line Items]
2023	$ 1		$ 93
2022	104		150
2021	112		98
2020	68		62
2019	43		35
Prior	36		26
Total	$ 363	$ 302	$ 465
Percent of portfolio	0.50%	0.50%	0.70%
Retail Finance Receivables | Nonperforming Financial Instruments | Finance receivables more than 30 days delinquent
Financing Receivable, Past Due [Line Items]
2023	$ 17		$ 403
2022	420		603
2021	475		373
2020	290		246
2019	190		138
Prior	160		95
Total	$ 1,551	$ 1,285	$ 1,857
Percent of portfolio	2.30%	2.20%	2.80%
Retail Finance Receivables | Nonperforming Financial Instruments | In repossession
Financing Receivable, Past Due [Line Items]
2023	$ 0		$ 11
2022	17		14
2021	15		6
2020	6		4
2019	3		2
Prior	2		1
Total	$ 44	$ 39	$ 39
Percent of portfolio	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	$ 17		$ 414
2022	437		617
2021	489		380
2020	296		249
2019	193		140
Prior	162		96
Total	$ 1,595	$ 1,324	$ 1,896
Percent of portfolio	2.40%	2.20%	2.90%