Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenue	$ 2,069	$ 2,206	$ 6,156	$ 6,586
Income/(loss) before income taxes	393	581	1,283	1,898
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	640	464	1,808	1,236
Interest expense	741	888	2,318	2,676
Provision for credit losses	42	(20)	(33)	(109)
Net finance receivables and net investment in operating leases	85,466	80,120	85,466	80,120
Total assets	101,327	97,483	101,327	97,483	100,242
North America Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	1,636	1,678	4,885	5,076
Income/(loss) before income taxes	334	465	1,173	1,723
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	550	381	1,547	1,042
Interest expense	551	655	1,704	1,839
Provision for credit losses	41	(12)	(33)	(103)
Net finance receivables and net investment in operating leases	70,335	63,011	70,335	63,011
Total assets	81,521	75,308	81,521	75,308
International Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	437	499	1,370	1,591
Income/(loss) before income taxes	63	84	202	251
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	90	83	261	194
Interest expense	190	236	622	842
Provision for credit losses	1	(8)	0	(6)
Net finance receivables and net investment in operating leases	16,688	18,858	16,688	18,858
Total assets	21,363	23,924	21,363	23,924
Unfavorable cumulative pre-tax adjustment			37
Total Unallocated/Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(4)	29	(99)	(81)
Income/(loss) before income taxes	(4)	32	(92)	(76)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	0	(3)	(8)	(5)
Provision for credit losses	0	0	0	0
Net finance receivables and net investment in operating leases	(1,557)	(1,749)	(1,557)	(1,749)
Total assets	(1,557)	(1,749)	(1,557)	(1,749)
Unallocated Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenue	(4)	29	(99)	(81)
Income/(loss) before income taxes	(4)	32	(92)	(76)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	0	(3)	(8)	(5)
Provision for credit losses	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	0	0
Income/(loss) before income taxes	0	0	0	0
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	0	0	0	0
Provision for credit losses	0	0	0	0
Net finance receivables and net investment in operating leases	(1,557)	(1,749)	(1,557)	(1,749)
Total assets	$ (1,557)	$ (1,749)	$ (1,557)	$ (1,749)