Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total revenue	$ 2,117	$ 2,069	$ 2,020	$ 2,067	$ 2,137	$ 2,206	$ 2,153	$ 2,227	$ 8,273	$ 8,723	$ 10,147
Income before income taxes									1,697	2,404	3,054
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	660	640	583	585	538	464	361	411	2,468	1,774	1,945
Interest expense	709	741	774	803	831	888	895	893	3,027	3,507	4,222
Provision for credit losses	40	42	(51)	(24)	(9)	(20)	(25)	(64)	7	(118)	(269)
Net finance receivables and net investment in operating leases	89,764				83,005				89,764	83,005	81,258
Total assets	105,744				100,242				105,744	100,242	101,696
North America Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									6,583	6,676	8,125
Income before income taxes									1,550	2,159	2,785
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									2,117	1,490	1,784
Interest expense									2,222	2,408	3,054
Provision for credit losses									18	(119)	(287)
Net finance receivables and net investment in operating leases	74,143				66,295				74,143	66,295	63,332
Total assets	84,112				77,666				84,112	77,666	77,835
International Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									1,799	2,182	2,117
Income before income taxes									249	371	354
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									351	284	161
Interest expense									812	1,108	1,169
Provision for credit losses									(11)	1	18
Net finance receivables and net investment in operating leases	17,107				18,353				17,107	18,353	19,807
Total assets	23,118				24,219				23,118	24,219	25,742
Unfavorable cumulative pre-tax adjustment									37
Total Unallocated/Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue									(109)	(135)	(95)
Income before income taxes									(102)	(126)	(85)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									(7)	(9)	(1)
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(1,486)				(1,643)				(1,486)	(1,643)	(1,881)
Total assets	(1,486)				(1,643)				(1,486)	(1,643)	(1,881)
Unallocated Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenue									(109)	(135)	(85)
Income before income taxes									(102)	(126)	(85)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									(7)	(9)	0
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	0				0				0	0	0
Total assets	0				0				0	0	0
Effect of Sales of Receivables [Member]
Segment Reporting Information [Line Items]
Total revenue									0	0	(10)
Income before income taxes									0	0	0
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									0	0	(1)
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	0				0				0	0	0
Total assets	0				0				0	0	0
Effect of Unearned Interest Supplements [Member]
Segment Reporting Information [Line Items]
Total revenue									0	0	0
Income before income taxes									0	0	0
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									0	0	0
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(1,486)				(1,643)				(1,486)	(1,643)	(1,881)
Total assets	$ (1,486)				$ (1,643)				$ (1,486)	$ (1,643)	$ (1,881)