Segment Information Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 2,282	$ 2,159
Income before income taxes	483	499
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	816	705
Interest expense	638	666
Provision for credit losses	67	31
Net finance receivables and net investment in operating leases	108,482	102,878
Total assets	126,375	118,364	122,108
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	0	0
Net finance receivables and net investment in operating leases	(4,379)	(3,587)
Total assets	0	0
North America Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	1,897	1,769
Income before income taxes	379	378
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	811	695
Interest expense	482	512
Provision for credit losses	55	29
Net finance receivables and net investment in operating leases	91,203	85,130
Total assets	100,692	92,566
International Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	410	401
Income before income taxes	129	132
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	5	10
Interest expense	156	154
Provision for credit losses	12	2
Net finance receivables and net investment in operating leases	21,658	21,335
Total assets	25,683	25,798
Total Unallocated/Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(25)	(11)
Income before income taxes	(25)	(11)
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	(4,379)	(3,587)
Total assets	0	0
Unallocated Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenue	(25)	(11)
Income before income taxes	(25)	(11)
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	0	0
Total assets	$ 0	$ 0