v3.2.0.727
Short-Term and Long-Term Debt ST and LT Debt Other Disclosures (Details) - GM Financial [Member]
€ in Millions, CAD in Millions, $ in Millions
1 Months Ended 6 Months Ended
Jul. 31, 2015
USD ($)
May. 31, 2015
CAD
Apr. 30, 2015
USD ($)
Feb. 28, 2015
EUR (€)
Jan. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Secured Debt [Member] | Securitization notes payable [Member]            
Debt Instrument [Line Items]            
Securitization Notes Payable Issued           $ 6,800
Secured Debt [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line Of Credit Increase Maximum Borrowing Capacity           $ 4,100
Unsecured Debt [Member] | Senior Notes Issued January 2015 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 2,250  
Unsecured Debt [Member] | Senior Notes January 2020 at 3.15% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage         3.15%  
Debt Instrument, Maturity Date         Jan. 31, 2020  
Unsecured Debt [Member] | Senior Notes January 2025 at 4.0% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage         4.00%  
Debt Instrument, Maturity Date         Jan. 31, 2025  
Unsecured Debt [Member] | Senior Notes January 2020 at Floating Rates [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 250  
Debt Instrument, Maturity Date         Jan. 31, 2020  
Unsecured Debt [Member] | Term Notes February 2018 at 0.85% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount | €       € 650    
Debt Instrument, Interest Rate, Stated Percentage       0.85%    
Debt Instrument, Maturity Date       Feb. 28, 2018    
Unsecured Debt [Member] | Senior Notes Issued April 2015 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 2,400      
Unsecured Debt [Member] | Senior Notes April 2018 at 2.4% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 850      
Debt Instrument, Interest Rate, Stated Percentage     2.40%      
Debt Instrument, Maturity Date     Apr. 30, 2018      
Unsecured Debt [Member] | Senior Notes April 2022 at 3.45% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 1,250      
Debt Instrument, Interest Rate, Stated Percentage     3.45%      
Debt Instrument, Maturity Date     Apr. 30, 2022      
Unsecured Debt [Member] | Senior Notes April 2018 at Floating Rates [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 300      
Debt Instrument, Maturity Date     Apr. 30, 2018      
Unsecured Debt [Member] | Senior Notes May 2020 at 3.08% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount | CAD   CAD 500        
Debt Instrument, Interest Rate, Stated Percentage   3.08%        
Debt Instrument, Maturity Date   May 31, 2020        
Subsequent Event [Member] | Unsecured Debt [Member] | Senior Notes Issued July 2015 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 2,300          
Subsequent Event [Member] | Unsecured Debt [Member] | Senior Notes July 2020 at 3.2% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 1,500          
Debt Instrument, Interest Rate, Stated Percentage 3.20%          
Debt Instrument, Maturity Date Jul. 31, 2020          
Subsequent Event [Member] | Unsecured Debt [Member] | Senior Notes July 2025 at 4.3% [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 800          
Debt Instrument, Interest Rate, Stated Percentage 4.30%          
Debt Instrument, Maturity Date Jul. 31, 2025