Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 3,363	$ 2,828	$ 9,752	$ 8,139
Income before income taxes	544	358	1,213	1,042
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	600	576	1,823	1,690
Interest expense	1,878	1,653	5,623	4,575
Financing Receivable, Credit Loss, Expense (Reversal)	99	74	282	191
Provision for credit losses	99	74	282	191
Net finance receivables and net investment in operating leases	142,207	126,327	142,207	126,327
Total assets	157,056	143,551	157,056	143,551	$ 149,205
Reportable segments
Segment Reporting Information [Line Items]
Total revenue	3,363	2,828	9,752	8,139
Income before income taxes	631	356	1,382	1,140
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	600	576	1,823	1,690
Interest expense	1,830	1,604	5,381	4,457
Financing Receivable, Credit Loss, Expense (Reversal)	99	74	282	191
Net finance receivables and net investment in operating leases	142,207	126,327	142,207	126,327
Total assets	157,056	143,551	157,056	143,551
Reportable segments | All Other
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	4,446	5,112	4,446	5,112
Total assets	5,035	5,665	5,035	5,665
Reportable segments | United States and Canada
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	116,916	101,885	116,916	101,885
Total assets	127,289	114,585	127,289	114,585
Reportable segments | Europe
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	20,845	19,330	20,845	19,330
Total assets	24,732	23,301	24,732	23,301
Reportable segments | United States and Canada
Segment Reporting Information [Line Items]
Total revenue	2,877	2,366	8,278	6,841
Income before income taxes	461	257	1,022	801
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	591	568	1,800	1,676
Interest expense	1,551	1,354	4,530	3,807
Financing Receivable, Credit Loss, Expense (Reversal)	83	71	223	170
Reportable segments | Europe
Segment Reporting Information [Line Items]
Total revenue	375	346	1,127	974
Income before income taxes	149	78	309	269
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	9	8	23	14
Interest expense	216	185	653	477
Financing Receivable, Credit Loss, Expense (Reversal)	6	4	18	6
Reportable segments | All Other
Segment Reporting Information [Line Items]
Total revenue	111	116	347	324
Income before income taxes	21	21	51	70
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	63	65	198	173
Financing Receivable, Credit Loss, Expense (Reversal)	10	(1)	41	15
Unallocated other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Income before income taxes	(87)	2	(169)	(98)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	48	49	242	118
Financing Receivable, Credit Loss, Expense (Reversal)	0	0	0	0
Net finance receivables and net investment in operating leases	0	0	0	0
Total assets	$ 0	$ 0	$ 0	$ 0