GM Financial Receivables, Net Summary of Finance Receivables, Net (Details) (GM Financial [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	$ 660		$ 1,294
Pre-acquisition finance receivables, carrying amount	598		1,174
Post-acquisition finance receivables, net of fees	31,311		28,006
Total finance receivables	31,909		29,180
Less: Allowance for Loan Losses	(645)	(615)	(548)	(496)	(447)	(351)
Total Finance Receivables, Net	31,264		28,632
Finance Receivables, Fair Value	31,607		28,668
Allowance for Loan Losses - Current	502		427
Consumer Finance Receivables [Member]
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	660		1,294
Pre-acquisition finance receivables, carrying amount	598		1,174
Post-acquisition finance receivables, net of fees	24,618		21,956
Total finance receivables	25,216		23,130
Less: Allowance for Loan Losses	(608)		(497)
Total Finance Receivables, Net	24,608		22,633
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	0		0
Pre-acquisition finance receivables, carrying amount	0		0
Post-acquisition finance receivables, net of fees	6,693		6,050
Total finance receivables	6,693		6,050
Less: Allowance for Loan Losses	(37)		(51)
Total Finance Receivables, Net	$ 6,656		$ 5,999