Finance Receivables - Delinquency (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gross charge-offs
2024	$ 171	$ 143
2023	556	494
2022	495	399
2021	305	192
2020	126	108
Prior	102	87
Total	1,754	1,423
Retail Finance Receivables
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	31,101	30,253
2023	20,100	20,259
2022	12,802	12,670
2021	7,642	6,842
2020	3,575	2,000
Prior	847	707
Total	$ 76,066	$ 72,729
Percent of portfolio	100.00%	100.00%
Gross charge-offs
Total	$ 1,754	$ 1,423	$ 1,138
Retail Finance Receivables | 0 - 30 days | Performing Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	30,581	29,816
2023	19,411	19,602
2022	12,207	12,098
2021	7,178	6,533
2020	3,350	1,825
Prior	710	599
Total	$ 73,438	$ 70,472
Percent of portfolio	96.50%	96.90%
Retail Finance Receivables | 31 - 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	$ 374	$ 318
2023	481	470
2022	425	415
2021	340	227
2020	166	130
Prior	99	78
Total	$ 1,885	$ 1,637
Percent of portfolio	2.50%	2.30%
Retail Finance Receivables | Greater than 60 days | Nonperforming Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	$ 128	$ 102
2023	188	168
2022	155	142
2021	115	76
2020	55	42
Prior	36	29
Total	$ 677	$ 559
Percent of portfolio	0.90%	0.80%
Retail Finance Receivables | Finance receivables more than 30 days delinquent | Nonperforming Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	$ 502	$ 421
2023	669	637
2022	580	557
2021	455	302
2020	221	172
Prior	135	107
Total	$ 2,562	$ 2,196
Percent of portfolio	3.40%	3.00%
Retail Finance Receivables | In repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	$ 17	$ 17
2023	19	20
2022	14	14
2021	10	6
2020	3	3
Prior	2	1
Total	$ 66	$ 61
Percent of portfolio	0.10%	0.10%
Retail Finance Receivables | Finance receivables more than 30 days delinquent or in repossession | Nonperforming Financial Instruments
Financing Receivable, Past Due and Not Past Due [Abstract]
2024	$ 519	$ 437
2023	689	657
2022	595	572
2021	464	308
2020	225	175
Prior	136	108
Total	$ 2,628	$ 2,257
Percent of portfolio	3.50%	3.10%