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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
jurisdiction
Jun. 30, 2019
USD ($)
action
shares
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
action
employee
shares
Dec. 31, 2019
USD ($)
Jul. 15, 2019
USD ($)
Dec. 31, 2018
USD ($)
state
Aug. 31, 2017
state
Indirect Tax Matters [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss   $ 950,000,000   $ 950,000,000        
Ignition Switch Recall Litigations - Economic-loss cases [Member]                
Loss Contingencies [Line Items]                
Number of filed claims | action   100   100        
Ignition Switch Recall Litigations - Economic-loss cases [Member] | Pending Litigation [Member]                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 27              
Ignition Switch Recall Litigations - July 2009 Sale Order [Member]                
Loss Contingencies [Line Items]                
Number of states | state               16
Ignition Switch Recall Litigations - July 2009 Sale Order [Member] | Granted Motion to Dismiss [Member]                
Loss Contingencies [Line Items]                
Number of states | state               7
Ignition Switch Recall Litigations - July 2009 Sale Order [Member] | Pending Litigation [Member]                
Loss Contingencies [Line Items]                
Number of states | state             8 9
Ignition Switch Recall Litigations - Lost Personal Time and Certain Unjust Enrichment Claims [Member]                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 47              
Ignition Switch Recall Litigations - Lost Personal Time and Certain Unjust Enrichment Claims [Member] | Granted Motion to Dismiss [Member]                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 41              
Korea Wage Litigation - Hourly [Member]                
Loss Contingencies [Line Items]                
Number of plaintiffs | employee       10,000        
Number of employees in the case | employee       5        
Estimate of possible loss   $ 590,000,000   $ 590,000,000        
Korea Wage Litigation - Salaried [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss   160,000,000   160,000,000        
Korea Wage Litigation - Former Subcontract Workers [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss   140,000,000   140,000,000        
GM Brazil Indirect Tax Claim [Member] | Brazil [Member]                
Loss Contingencies [Line Items]                
Favorable settlement amount   380,000,000 $ 857,000,000          
GM Brazil Indirect Tax Claim [Member] | Forecast [Member] | Brazil [Member]                
Loss Contingencies [Line Items]                
Favorable settlement amount         $ 100,000,000      
Accrued liabilities and Other liabilities [Member]                
Loss Contingencies [Line Items]                
Estimated litigation liability   1,400,000,000   1,400,000,000     $ 1,300,000,000  
Amended and Restated Master Sale and Purchase Agreement [Member] | Ignition Switch Recall Litigations - Contingently Issuable Shares [Member]                
Loss Contingencies [Line Items]                
Allowed general unsecured claims amount   $ 35,000,000,000.0   $ 35,000,000,000.0        
Contingently issuable shares (in shares) | shares   30,000,000   30,000,000        
Amount of allowed general unsecured claims     $ 31,900,000,000          
Amended and Restated Master Sale and Purchase Agreement [Member] | Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Subsequent Event [Member]                
Loss Contingencies [Line Items]                
Value of contingently issuable shares           $ 1,200,000,000