GM Financial Finance Receivables, Net Allowance for Loan Losses (Details) (GM Financial [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		$ 351	$ 179
Consumer Finance Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current		266	136
Non-current		85	43
Financing Receivable, Allowance for Credit Losses	26	351	179	0
Provision for Loan Losses	26	304	178
Charge-offs	0	(304)	(66)
Recoveries	$ 0	$ 172	$ 41