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Commitments and Contingencies Litigation-Related Liability and Tax Administrative Matters (Details)
CAD in Millions, $ in Millions, ₩ in Billions
 1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 10 Months Ended
Feb. 28, 2010
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Aug. 31, 2016
Sep. 30, 2016
CAD
employee
Oct. 19, 2016
Sep. 30, 2016
USD ($)
Sep. 30, 2016
KRW (₩)
Dec. 31, 2015
USD ($)
Nov. 27, 2015
Nov. 26, 2015
Indirect Tax Matters [Member]                      
Loss Contingencies [Line Items]                      
Range of Possible Loss, Portion Not Accrued             $ 1,000        
Minimum [Member]                      
Loss Contingencies [Line Items]                      
Indirect Tax-Related Escrow Deposit             300        
Maximum [Member]                      
Loss Contingencies [Line Items]                      
Indirect Tax-Related Escrow Deposit             $ 700        
Ignition Switch Recall Litigations [Member]                      
Loss Contingencies [Line Items]                      
State Attorneys General, Number         50            
Ignition Switch Recall Litigations - Economic-loss cases [Member] | Subsequent Event [Member] | U.S.                      
Loss Contingencies [Line Items]                      
Pending Claims, Number           100          
Ignition Switch Recall Litigations - Economic-loss cases [Member] | Subsequent Event [Member] | CANADA                      
Loss Contingencies [Line Items]                      
Pending Claims, Number           17          
Ignition Switch Recall Litigations - Civil Actions Brought by Governmental Entities [Member] | Subsequent Event [Member]                      
Loss Contingencies [Line Items]                      
Pending Claims, Number           2          
Ignition Switch Recall Litigations - Personal injury cases [Member] | Subsequent Event [Member] | U.S.                      
Loss Contingencies [Line Items]                      
Pending Claims, Number           286          
Ignition Switch Recall Litigations - Personal injury cases [Member] | Subsequent Event [Member] | CANADA                      
Loss Contingencies [Line Items]                      
Pending Claims, Number           18          
Ignition Switch Recall Litigations - Multidistrict Litigation [Member]                      
Loss Contingencies [Line Items]                      
Litigation Settlement, Amount   $ 275                  
Number of claimants settled     1,400                
Ignition Switch Recall Litigations - Multidistrict Litigation [Member] | NEW YORK                      
Loss Contingencies [Line Items]                      
Claims Scheduled for Trial, Number         6            
Ignition Switch Recall Litigations - Multidistrict Litigation [Member] | Subsequent Event [Member] | NEW YORK                      
Loss Contingencies [Line Items]                      
Claims Dismissed, Number           2          
Claims Settled, Number           4          
Ignition Switch Recall Litigations - Multidistrict Litigation [Member] | Subsequent Event [Member] | NEW YORK | Consolidated Litigation [Member]                      
Loss Contingencies [Line Items]                      
Transferred Claims, Number           306          
Ignition Switch Recall Litigations - Multidistrict Litigation State [Member] | TEXAS                      
Loss Contingencies [Line Items]                      
Claims Dismissed, Number         1            
Claims Settled, Number       1              
Ignition Switch Recall Litigations - Shareholder Derivative Action [Member] | DELAWARE | Consolidated Litigation [Member]                      
Loss Contingencies [Line Items]                      
Claims Dismissed, Number         4            
Ignition Switch Recall Litigations - Shareholder Derivative Action [Member] | Eastern District of Michigan [Member] | Consolidated Litigation [Member]                      
Loss Contingencies [Line Items]                      
Pending Claims, Number             3 3      
Ignition Switch Recall Litigations - Shareholder Derivative Action [Member] | Wayne County, Michigan [Member] | Consolidated Litigation [Member]                      
Loss Contingencies [Line Items]                      
Pending Claims, Number             2 2      
Ignition Switch Recall Litigations - Investigation by the Office [Member]                      
Loss Contingencies [Line Items]                      
Damages Paid, Value     $ 900                
Prosecution Deferral Period     3 years                
Period after the expiration of the period of deferral     30 days                
Ignition Switch Recall Litigations - Shareholder Class Action [Member]                      
Loss Contingencies [Line Items]                      
Litigation Settlement, Amount   $ 300                  
Number of shareholders opting out of settlement   1                  
Number of shareholders filing an appeal   1                  
GM Canada Dealer Litigation [Member]                      
Loss Contingencies [Line Items]                      
Number of Plaintiffs 200       181            
Damages Sought, Value | CAD         CAD 750            
Korea Wage Litigation - Hourly [Member]                      
Loss Contingencies [Line Items]                      
Number of Plaintiffs | employee         10,000            
Number Of Group Actions Filed         8            
Number of Employees in the Case | employee         5            
Range of Possible Loss, Portion Not Accrued             $ 551 ₩ 604      
Korea Wage Litigation - Salaried [Member]                      
Loss Contingencies [Line Items]                      
Claims Remanded, Number                   1 1
Accrued liabilities and Other liabilities [Member]                      
Loss Contingencies [Line Items]                      
Estimated Litigation Liability             $ 1,300   $ 1,200