Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 2,312	$ 2,083	$ 6,705	$ 6,026
Income before income taxes	498	427	1,431	1,388
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	801	629	2,248	1,663
Interest expense	663	691	2,002	2,056
Provision for credit losses (Note 4)	57	32	115	81
Net finance receivables and net investment in operating leases	106,113	96,074	106,113	96,074
Total assets	121,216	111,834	121,216	111,834	115,608
Adjustment to Receivables [Member]
Segment Reporting Information [Line Items]
Total revenue			0	0
Income before income taxes			0	0
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases			0	0
Interest expense			0	0
Provision for credit losses (Note 4)			0	0
Net finance receivables and net investment in operating leases	(4,252)	(3,336)	(4,252)	(3,336)
Total assets	0	0	0	0
North America Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	1,883	1,711	5,470	4,931
Income before income taxes	374	358	1,069	1,156
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	791	621	2,218	1,641
Interest expense	498	536	1,521	1,576
Provision for credit losses (Note 4)	48	31	94	57
Net finance receivables and net investment in operating leases	88,599	80,236	88,599	80,236
Total assets	95,491	88,476	95,491	88,476
International Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	438	394	1,258	1,133
Income before income taxes	133	91	385	270
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	10	8	30	22
Interest expense	165	155	481	480
Provision for credit losses (Note 4)	9	1	21	24
Net finance receivables and net investment in operating leases	21,766	19,174	21,766	19,174
Total assets	25,725	23,358	25,725	23,358
Unallocated Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenue	(9)	(22)	(23)	(38)
Income before income taxes	(9)	(22)	(23)	(38)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	0	0	0	0
Provision for credit losses (Note 4)	0	0	0	0
Net finance receivables and net investment in operating leases	0	0	0	0
Total assets	0	0	0	0
Effect of Unearned Interest Supplements [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0
Income before income taxes	0	0
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0
Interest expense	0	0
Provision for credit losses (Note 4)	0	0
Total Unallocated/Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(9)	(22)	(23)	(38)
Income before income taxes	(9)	(22)	(23)	(38)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	0	0	0	0
Provision for credit losses (Note 4)	0	0	0	0
Net finance receivables and net investment in operating leases	(4,252)	(3,336)	(4,252)	(3,336)
Total assets	$ 0	$ 0	$ 0	$ 0