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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
Jun. 30, 2020
USD ($)
action
recall
Sep. 30, 2018
jurisdiction
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
action
employee
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
case
Apr. 30, 2018
state
Aug. 31, 2017
state
Loss Contingencies [Line Items]                
Estimated litigation liability $ 1,200,000,000     $ 1,200,000,000   $ 1,300,000,000    
Indirect Tax Matters [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss $ 700,000,000     $ 700,000,000        
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 - Economic-loss cases [Member] | Proposed Settlement [Member]                
Loss Contingencies [Line Items]                
Number of safety recalls | recall 7              
Amount awarded to other party $ 120,000,000              
Attorneys' fees and costs 35,000,000              
Ignition Switch Recall Litigations - 2009 Sales Order [Member]                
Loss Contingencies [Line Items]                
Number of states | state               16
Ignition Switch Recall Litigations - 2009 Sales Order [Member] | Granted Motion to Dismiss [Member]                
Loss Contingencies [Line Items]                
Number of states | state               7
Ignition Switch Recall Litigations - 2009 Sales 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        
Korea Wage Litigation - Salaried [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss 170,000,000     $ 170,000,000        
Korea Wage Litigation - Former Subcontract Workers [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss 110,000,000     110,000,000        
Probable loss accrual 190,000,000     190,000,000        
GM Brazil Indirect Tax Claim [Member] | Brazil [Member]                
Loss Contingencies [Line Items]                
Recoveries of indirect taxes     $ 380,000,000   $ 1,200,000,000      
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        
Foreign Tax Authority [Member] | Brazil [Member]                
Loss Contingencies [Line Items]                
Number of rendered favorable decisions | case           3    
Recoveries of indirect taxes           $ 1,400,000,000    
MLC GUC Trust [Member] | Ignition Switch Recall Litigations - Economic-loss cases [Member] | Proposed Settlement [Member]                
Loss Contingencies [Line Items]                
Amount awarded to other party 50,000,000              
MLC GUC Trust [Member] | Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Proposed Settlement [Member]                
Loss Contingencies [Line Items]                
Amount petitioned to be distributed to unitholders 300,000,000     $ 300,000,000        
GM [Member] | Ignition Switch Recall Litigations - Economic-loss cases [Member] | Proposed Settlement [Member]                
Loss Contingencies [Line Items]                
Amount awarded to other party $ 70,000,000