Finance Receivables - Delinquency (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023	$ 143
2022	494
2021	399
2020	192
2019	108
Prior	87
Total	1,423
Retail Finance Receivables
Financing Receivable, Past Due [Line Items]
2023	30,253	$ 29,090
2022	20,259	18,745
2021	12,670	11,081
2020	6,842	3,992
2019	2,000	1,824
Prior	707	589
Total	$ 72,729	$ 65,322
Percent	100.00%	100.00%
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	$ 1,423	$ 1,138	$ 897
Retail Finance Receivables | 0 - 30 days | Performing Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	29,816	28,676
2022	19,602	18,128
2021	12,098	10,702
2020	6,533	3,743
2019	1,825	1,685
Prior	599	493
Total	$ 70,472	$ 63,426
Percent	96.90%	97.10%
Retail Finance Receivables | 31 - 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	$ 318	$ 310
2022	470	452
2021	415	275
2020	227	184
2019	130	103
Prior	78	69
Total	$ 1,637	$ 1,393
Percent	2.30%	2.10%
Retail Finance Receivables | Greater than 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	$ 102	$ 93
2022	168	150
2021	142	98
2020	76	62
2019	42	35
Prior	29	26
Total	$ 559	$ 465
Percent	0.80%	0.70%
Retail Finance Receivables | Finance receivables more than 30 days delinquent | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	$ 421	$ 403
2022	637	603
2021	557	373
2020	302	246
2019	172	138
Prior	107	95
Total	$ 2,196	$ 1,857
Percent	3.00%	2.80%
Retail Finance Receivables | In repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	$ 17	$ 11
2022	20	14
2021	14	6
2020	6	4
2019	3	2
Prior	1	1
Total	$ 61	$ 39
Percent	0.10%	0.10%
Retail Finance Receivables | Finance receivables more than 30 days delinquent or in repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
2023	$ 437	$ 414
2022	657	617
2021	572	380
2020	308	249
2019	175	140
Prior	108	96
Total	$ 2,257	$ 1,896
Percent	3.10%	2.90%