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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details)
 1 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Sep. 30, 2018
jurisdiction
Dec. 31, 2020
USD ($)
action
Dec. 31, 2020
USD ($)
recall
action
Dec. 31, 2020
USD ($)
employee
action
Dec. 31, 2019
USD ($)
Dec. 31, 2017
state
Aug. 31, 2017
state
Indirect Tax Matters              
Loss Contingencies [Line Items]              
Reasonably possible loss   $ 750,000,000 $ 750,000,000 $ 750,000,000      
Ignition Switch Recall Litigations - Economic Damage | Pending Litigation              
Loss Contingencies [Line Items]              
Number of jurisdictions | jurisdiction 27            
Ignition Switch Recall Litigations - Economic Damage | Proposed Settlement              
Loss Contingencies [Line Items]              
Number of safety recalls | recall     7        
Amount awarded to other party     $ 120,000,000        
Ignition Switch Recall Litigations - Economic Damage | Proposed Settlement | Maximum              
Loss Contingencies [Line Items]              
Attorneys' fees and costs     $ 35,000,000        
Ignition Switch Recall Litigations - Economic Damage | U.S. and Canada              
Loss Contingencies [Line Items]              
Number of filed claims | action   100 100 100      
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 - Lost Personal Time and Certain Unjust Enrichment Claims | Granted Motion to Dismiss              
Loss Contingencies [Line Items]              
Number of jurisdictions | jurisdiction 41            
Ignition Switch Recall Litigations - July 2009 Sale Order              
Loss Contingencies [Line Items]              
Number of states | state             16
Ignition Switch Recall Litigations - July 2009 Sale Order | Granted Motion to Dismiss              
Loss Contingencies [Line Items]              
Number of states | state             7
Ignition Switch Recall Litigations - July 2009 Sale Order | Pending Litigation              
Loss Contingencies [Line Items]              
Number of states | state           8 9
Korea Wage Litigation - Hourly              
Loss Contingencies [Line Items]              
Number of plaintiffs | employee       10,000      
Number of employees in the case | employee       5      
Korea Wage Litigation - Salaried              
Loss Contingencies [Line Items]              
Reasonably possible loss   $ 190,000,000 $ 190,000,000 $ 190,000,000      
Korea Wage Litigation - Former Subcontract Workers              
Loss Contingencies [Line Items]              
Reasonably possible loss   120,000,000 120,000,000 120,000,000      
Takata Passenger-side Airbags              
Loss Contingencies [Line Items]              
Increase in product warranty accrual   1,100,000,000          
Amended and Restated Master Sale and Purchase Agreement | Ignition Switch Recall Litigations - Contingently Issuable Shares              
Loss Contingencies [Line Items]              
Allowed general unsecured claims amount   35,000,000,000.0 35,000,000,000.0 35,000,000,000.0      
Foreign Tax Authority | Brazil              
Loss Contingencies [Line Items]              
Estimated potential recovery from taxing authority         $ 1,400,000,000    
MLC GUC Trust | Ignition Switch Recall Litigations - Economic Damage | Proposed Settlement              
Loss Contingencies [Line Items]              
Amount awarded to other party     50,000,000        
MLC GUC Trust | Ignition Switch Recall Litigations - Contingently Issuable Shares | Proposed Settlement              
Loss Contingencies [Line Items]              
Amount petitioned to be distributed to unitholders   $ 300,000,000 300,000,000 $ 300,000,000      
GM | Ignition Switch Recall Litigations - Economic Damage | Proposed Settlement              
Loss Contingencies [Line Items]              
Amount awarded to other party     $ 70,000,000