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Commitments and Contingencies - Ignition Switch Recall (Details)
 1 Months Ended 12 Months Ended
Sep. 30, 2018
jurisdiction
Dec. 31, 2019
USD ($)
action
case
employee
shares
Dec. 31, 2012
employee
Jan. 24, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
state
Aug. 31, 2017
state
Ignition Switch Recall Litigations - July 2009 Sale Order                
Loss Contingencies [Line Items]                
Number of states | state               16
Ignition Switch Recall Litigations - Lost Personal Time and Certain Unjust Enrichment Claims                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 47              
Ignition Switch Recall Litigations - Contingently Issuable Shares | Amended and Restated Master Sale and Purchase Agreement                
Loss Contingencies [Line Items]                
Allowed general unsecured claims amount   $ 35,000,000,000.0            
Contingently issuable shares (in shares) | shares   30,000,000            
Amount of allowed general unsecured claims         $ 32,100,000,000      
Korea Wage Litigation - Hourly                
Loss Contingencies [Line Items]                
Number of plaintiffs | employee   10,000            
Number of employees in the case | employee     5          
Reasonably possible loss   $ 600,000,000            
Korea Wage Litigation - Salaried                
Loss Contingencies [Line Items]                
Reasonably possible loss   170,000,000            
Korea Wage Litigation - Former Subcontract Workers                
Loss Contingencies [Line Items]                
Reasonably possible loss   $ 110,000,000            
U.S. and Canada | Ignition Switch Recall Litigations - Economic Damage                
Loss Contingencies [Line Items]                
Number of pending claims | action   100            
Foreign Tax Authority | Brazil                
Loss Contingencies [Line Items]                
Number of claims settled | case   3            
Estimated potential recovery from taxing authority   $ 1,400,000,000            
Subsequent Event | Ignition Switch Recall Litigations - Contingently Issuable Shares | Amended and Restated Master Sale and Purchase Agreement                
Loss Contingencies [Line Items]                
Value of contingently issuable shares       $ 1,000,000,000.0        
Granted Motion to Dismiss | Ignition Switch Recall Litigations - July 2009 Sale Order                
Loss Contingencies [Line Items]                
Number of states | state               7
Granted Motion to Dismiss | Ignition Switch Recall Litigations - Lost Personal Time and Certain Unjust Enrichment Claims                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 41              
Pending Litigation | Ignition Switch Recall Litigations - Economic Damage                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 27              
Pending Litigation | Ignition Switch Recall Litigations - July 2009 Sale Order                
Loss Contingencies [Line Items]                
Number of states | state             8 9
Accrued liabilities and Other liabilities                
Loss Contingencies [Line Items]                
Litigation-related liability and tax administrative matters   $ 1,300,000,000       $ 1,300,000,000