Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 545	$ 386
Cash flows from investing activities:
Purchases of consumer finance receivables, net	(4,065)	(3,320)
Principal collections and recoveries on consumer finance receivables	2,814	2,617
Net collections (funding) of commercial finance receivables	54	(255)
Purchases of leased vehicles, net	(2,319)	(628)
Proceeds from termination of leased vehicles	185	123
Acquisition of equity interest	(1,049)	0
Purchases of property and equipment	(17)	(7)
Change in restricted cash	(154)	(147)
Change in other assets	6	0
Net cash used in investing activities	(4,545)	(1,617)
Cash flows from financing activities:
Net change in debt (original maturities less than three months)	198	451
Borrowings and issuance of secured debt	2,889	5,070
Payments on secured debt	(2,748)	(4,238)
Borrowings and issuance of unsecured debt	3,258	390
Payments on unsecured debt	(308)	(330)
Debt issuance costs	(41)	(23)
Net cash provided by financing activities	3,248	1,320
Net (decrease) increase in cash and cash equivalents	(752)	89
Effect of foreign exchange rate changes on cash and cash equivalents	(101)	(1)
Cash and cash equivalents at beginning of period	2,974	1,074
Cash and cash equivalents at end of period	2,121	1,162
Supplemental cash flow information:
Subvention receivable from GM	252	111
Commercial loan funding payable to GM	425	462
Sale of equity interest in SAIC-GMAC	$ 125	$ 0