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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
state
recall
action
shares
Sep. 30, 2018
jurisdiction
Mar. 31, 2020
USD ($)
state
action
employee
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
case
Apr. 20, 2020
USD ($)
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 - 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   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 $ 580,000,000   $ 580,000,000        
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 110,000,000   110,000,000        
Probable loss accrual 180,000,000   180,000,000        
GM Brazil Indirect Tax Claim [Member] | Brazil [Member]              
Loss Contingencies [Line Items]              
Recoveries of indirect taxes       $ 857,000,000      
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         $ 32,100,000,000    
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           $ 671,000,000  
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            
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