Finance Receivables, Net Delinquency (Details) (Consumer Loans Auto Financing Receivable [Member], GM Financial [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Past Due	$ 611	$ 579
Percent of Contractual Amount Due	5.90%	6.40%
Delinquent Contract Not Yet in Repossession [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Past Due	586	556
Percent of Contractual Amount Due	5.60%	6.10%
Delinquent Contract Not Yet in Repossession [Member] \| 31-to-60 days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Past Due	428	398
Percent of Contractual Amount Due	4.10%	4.40%
Delinquent Contract Not Yet in Repossession [Member] \| Greater-than-60 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Past Due	158	158
Percent of Contractual Amount Due	1.50%	1.70%
Delinquent Contract in Repossession [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Past Due	$ 25	$ 23
Percent of Contractual Amount Due	0.30%	0.30%

Finance Receivables, Net Delinquency (Details) (Consumer Loans Auto Financing Receivable [Member], GM Financial [Member], USD $)
In Millions, unless otherwise specified

Jun. 30, 2012

Jun. 30, 2011

Financing Receivable, Recorded Investment, Past Due [Line Items]

Financing Receivable, Past Due

$ 611

$ 579

Percent of Contractual Amount Due

5.90%

6.40%

Delinquent Contract Not Yet in Repossession [Member]

Financing Receivable, Recorded Investment, Past Due [Line Items]

Financing Receivable, Past Due