v2.4.0.6
Debt Securitization Notes Payable (Details) (GM Financial [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Securitization notes payable [Line Items]    
Total Receivabels Pledged $ 8,456  
Secured Debt 7,527 6,895
Purchase accounting premium 32 43
Securitized Notes Payable 7,559 6,938
2006 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 0  
Secured Debt 0 63
Debt Instrument, Maturity Date Range, Start January 2014  
Debt Instrument, Maturity Date Range, End January 2014  
Original Note Amounts - Minimum 1,200  
Original Note Amounts - Maximum 1,200  
Original Weighted-Average Interest Rate - Minimum 5.40%  
Original Weighted-Average Interest Rate - Maximum 5.40%  
2007 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 402  
Secured Debt 379 794
Debt Instrument, Maturity Date Range, Start April 2014  
Debt Instrument, Maturity Date Range, End March 2016  
Original Note Amounts - Minimum 1,000  
Original Note Amounts - Maximum 1,500  
Original Weighted-Average Interest Rate - Minimum 5.30%  
Original Weighted-Average Interest Rate - Maximum 5.50%  
2008 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 416  
Secured Debt 146 171
Debt Instrument, Maturity Date Range, Start October 2014  
Debt Instrument, Maturity Date Range, End April 2015  
Original Note Amounts - Minimum 500  
Original Note Amounts - Maximum 750  
Original Weighted-Average Interest Rate - Minimum 6.00%  
Original Weighted-Average Interest Rate - Maximum 10.50%  
2009 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 354  
Secured Debt 258 298
Debt Instrument, Maturity Date Range, Start January 2016  
Debt Instrument, Maturity Date Range, End July 2017  
Original Note Amounts - Minimum 227  
Original Note Amounts - Maximum 725  
Original Weighted-Average Interest Rate - Minimum 2.70%  
Original Weighted-Average Interest Rate - Maximum 7.50%  
2010 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 1,790  
Secured Debt 1,575 1,756
Debt Instrument, Maturity Date Range, Start June 2016  
Debt Instrument, Maturity Date Range, End April 2018  
Original Note Amounts - Minimum 200  
Original Note Amounts - Maximum 850  
Original Weighted-Average Interest Rate - Minimum 2.20%  
Original Weighted-Average Interest Rate - Maximum 3.80%  
2011 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 3,723  
Secured Debt 3,458 3,813
Debt Instrument, Maturity Date Range, Start February 2017  
Debt Instrument, Maturity Date Range, End March 2019  
Original Note Amounts - Minimum 800  
Original Note Amounts - Maximum 1,000  
Original Weighted-Average Interest Rate - Minimum 2.40%  
Original Weighted-Average Interest Rate - Maximum 2.90%  
2012 Transactions [Member]
    
Securitization notes payable [Line Items]    
Total Receivabels Pledged 1,771  
Secured Debt 1,711  
Debt Instrument, Maturity Date Range, Start June 2019  
Debt Instrument, Maturity Date Range, End July 2019  
Original Note Amounts - Minimum 800  
Original Note Amounts - Maximum $ 1,000  
Original Weighted-Average Interest Rate - Minimum 2.50%  
Original Weighted-Average Interest Rate - Maximum 2.90%