Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 2,121	$ 2,067
Income before income taxes	507	452
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	642	585
Interest expense	683	803
Provision for credit losses	29	(24)
Net finance receivables and net investment in operating leases	92,530	84,528
Total assets	107,140	101,682	105,744
North America Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	1,690	1,612
Income before income taxes	407	404
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	585	495
Interest expense	517	576
Provision for credit losses	22	(23)
Net finance receivables and net investment in operating leases	76,497	67,416
Total assets	85,855	79,741
International Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	422	502
Income before income taxes	91	91
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	57	90
Interest expense	166	230
Provision for credit losses	7	(1)
Net finance receivables and net investment in operating leases	17,418	18,679
Total assets	22,670	23,508
Total Unallocated/Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	9	(47)
Income before income taxes	9	(43)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0
Interest expense	0	(3)
Provision for credit losses	0	0
Net finance receivables and net investment in operating leases	(1,385)	(1,567)
Total assets	(1,385)	(1,567)
Unallocated Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenue	9	(47)
Income before income taxes	9	(43)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0
Interest expense	0	(3)
Provision for credit losses	0	0
Net finance receivables and net investment in operating leases	0	0
Total assets	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	0	0
Net finance receivables and net investment in operating leases	(1,385)	(1,567)
Total assets	$ (1,385)	$ (1,567)