Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 3,486	$ 3,283	$ 6,906	$ 6,389
Income before income taxes	645	343	1,225	669
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	603	613	1,208	1,223
Interest expense	1,759	1,897	3,549	3,745
Financing Receivable, Credit Loss, Expense (Reversal)	114	95	254	183
Net finance receivables and net investment in operating leases	143,723	137,721	143,723	137,721
Total assets	158,742	150,627	158,742	150,627	$ 158,292
Segment Reporting, Other Segment Item, Amount	365	335	670	569
Reportable segments
Segment Reporting Information [Line Items]
Total revenue	3,486	3,283	6,906	6,389
Income before income taxes	556	396	1,116	751
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	603	613	1,208	1,223
Interest expense	1,722	1,801	3,451	3,551
Financing Receivable, Credit Loss, Expense (Reversal)	114	95	254	183
Net finance receivables and net investment in operating leases	143,723	137,721	143,723	137,721
Total assets	158,742	150,627	158,742	150,627
Segment Reporting, Other Segment Item, Amount	491	378	877	681
Reportable segments | All Other
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	3,672	4,569	3,672	4,569
Total assets	4,116	5,141	4,116	5,141
Reportable segments | United States and Canada
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	117,578	113,727	117,578	113,727
Total assets	128,747	122,702	128,747	122,702
Reportable segments | Europe
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	22,473	19,425	22,473	19,425
Total assets	25,879	22,784	25,879	22,784
Reportable segments | Americas
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	313	292	600	512
Reportable segments | Europe
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	163	65	238	129
Reportable segments | Asia Pacific
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	15	21	39	40
Reportable segments | United States and Canada
Segment Reporting Information [Line Items]
Total revenue	3,014	2,785	5,963	5,401
Income before income taxes	544	298	1,015	561
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	593	606	1,191	1,209
Interest expense	1,476	1,519	2,957	2,979
Financing Receivable, Credit Loss, Expense (Reversal)	88	70	200	140
Reportable segments | Europe
Segment Reporting Information [Line Items]
Total revenue	378	381	750	752
Income before income taxes	(5)	88	81	160
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	10	7	17	14
Interest expense	195	216	390	437
Financing Receivable, Credit Loss, Expense (Reversal)	15	5	24	12
Reportable segments | All Other
Segment Reporting Information [Line Items]
Total revenue	94	117	193	236
Income before income taxes	17	10	20	30
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	51	66	104	135
Financing Receivable, Credit Loss, Expense (Reversal)	11	20	30	31
Unallocated other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Income before income taxes	89	(53)	109	(82)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	37	96	98	194
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
Segment Reporting, Other Segment Item, Amount	$ (126)	$ (43)	$ (207)	$ (112)