Securitizations (Details) (GM Financial [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Securtizations [Line Items]
Finance Receivables Transferred to Securitization SPEs	$ 9,500,000,000		$ 9,500,000,000		$ 7,900,000,000
Receivables securitized	2,433,000,000	2,069,000,000	4,349,000,000	2,918,000,000
Net proceeds from securitizations	2,300,000,000	1,950,000,000	4,100,000,000	2,750,000,000
Servicing fees	59,000,000	49,000,000	118,000,000	98,000,000
Net distributions from Trusts	465,000,000	291,000,000	916,000,000	434,000,000
Canadaian Subsidiary [Member]
Securtizations [Line Items]
Leased Assets Serviced by Canadian Subsidiary	$ 802,000,000		$ 802,000,000		$ 1,000,000,000