Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 3,420	$ 3,106
Income before income taxes	580	326
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	605	610
Interest expense	1,790	1,848
Financing Receivable, Credit Loss, Expense (Reversal)	140	88
Segment Reporting, Other Segment Item, Amount	305	234
Net finance receivables and net investment in operating leases	141,555	135,474
Total assets	154,923	149,709	$ 158,292
Reportable segments
Segment Reporting Information [Line Items]
Total revenue	3,420	3,106
Income before income taxes	560	355
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	605	610
Interest expense	1,729	1,750
Financing Receivable, Credit Loss, Expense (Reversal)	140	88
Segment Reporting, Other Segment Item, Amount	386	303
Net finance receivables and net investment in operating leases	141,555	135,474
Total assets	154,923	149,709
Reportable segments | All Other
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	3,721	4,819
Total assets	4,146	5,350
Reportable segments | United States and Canada
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	117,362	110,674
Total assets	127,299	120,368
Reportable segments | Europe
Other disclosures [Abstract]
Net finance receivables and net investment in operating leases	20,472	19,981
Total assets	23,478	23,991
Reportable segments | Americas
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	287	220
Reportable segments | Europe
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	75	64
Reportable segments | Asia Pacific
Other disclosures [Abstract]
Segment Reporting, Other Segment Item, Amount	24	19
Reportable segments | United States and Canada
Segment Reporting Information [Line Items]
Total revenue	2,949	2,616
Income before income taxes	471	263
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	598	603
Interest expense	1,481	1,460
Financing Receivable, Credit Loss, Expense (Reversal)	112	70
Reportable segments | Europe
Segment Reporting Information [Line Items]
Total revenue	372	371
Income before income taxes	86	72
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	7	7
Interest expense	195	221
Financing Receivable, Credit Loss, Expense (Reversal)	9	7
Reportable segments | All Other
Segment Reporting Information [Line Items]
Total revenue	99	119
Income before income taxes	3	20
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0
Interest expense	53	69
Financing Receivable, Credit Loss, Expense (Reversal)	19	11
Unallocated other
Segment Reporting Information [Line Items]
Total revenue	0	0
Income before income taxes	20	(29)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0
Interest expense	61	98
Financing Receivable, Credit Loss, Expense (Reversal)	0	0
Segment Reporting, Other Segment Item, Amount	(81)	(69)
Net finance receivables and net investment in operating leases	0	0
Total assets	$ 0	$ 0