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Commitments and Contingencies Litigation-Related Liability and Tax Administrative Matters (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2018
jurisdiction
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
action
employee
shares
Dec. 31, 2019
USD ($)
Apr. 18, 2019
USD ($)
Dec. 31, 2018
USD ($)
state
Aug. 31, 2017
state
Indirect Tax Matters [Member]              
Loss Contingencies [Line Items]              
Estimate of possible loss     $ 900,000,000        
Ignition Switch Recall Litigations - Economic-loss cases [Member]              
Loss Contingencies [Line Items]              
Number of pending claims | action     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     $ 580,000,000        
Korea Wage Litigation - Salaried [Member]              
Loss Contingencies [Line Items]              
Estimate of possible loss     170,000,000        
Korea Wage Litigation - Former Subcontract Workers [Member]              
Loss Contingencies [Line Items]              
Estimate of possible loss     140,000,000        
GM Brazil Indirect Tax Claim [Member] | BRAZIL              
Loss Contingencies [Line Items]              
Favorable settlement amount     857,000,000        
GM Brazil Indirect Tax Claim [Member] | Forecast [Member] | BRAZIL              
Loss Contingencies [Line Items]              
Favorable settlement amount   $ 450,000,000   $ 100,000,000      
Accrued liabilities and Other liabilities [Member]              
Loss Contingencies [Line Items]              
Estimated litigation liability     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        
Contingently issuable shares (in shares) | shares     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