Condensed Consolidated Statement Of Changes In Equity (USD $) In Millions, unless otherwise specified		Total	Common stock and paid-in capital [Member]	Mandatorily convertible preferred stock held by U.S. Department Of Treasury [Member]	Preferred stock [Member]	Retained earnings (accumulated deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2010		$ 20,489	$ 19,668	$ 5,685	$ 1,287	$ (6,410)	$ 259
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		49				49
Preferred stock dividends - U.S. Department of Treasury		(400)				(400)
Preferred stock dividends		(194)				(194)
Series A preferred stock amendment	[1]	0			(32)	32
Other comprehensive income (loss)		(217)					(217)
Stockholders' Equity, Other	[2]	5				5
Ending Balance at Sep. 30, 2011		19,732	19,668	5,685	1,255	(6,918)	42
Beginning Balance at Dec. 31, 2011		19,371	19,668	5,685	1,255	(7,324)	87
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(204)				(204)
Preferred stock dividends - U.S. Department of Treasury		(401)				(401)
Preferred stock dividends		(200)				(200)
Other comprehensive income (loss)		199					199
Ending Balance at Sep. 30, 2012		$ 18,765	$ 19,668	$ 5,685	$ 1,255	$ (8,129)	$ 286

[1] Refer to Note 20 to the Consolidated Financial Statements in our 2011 Annual Report on Form 10-K for further detail.

[2] Represents a reduction of the estimated payment accrued for tax distributions as a result of the completion of the GMAC LLC U.S. Return of Partnership Income for the tax period January 1, 2009 through June 30, 2009.