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Commitments and Contingencies Ignition Switch Recall (Details)
 1 Months Ended 12 Months Ended
Sep. 30, 2018
jurisdiction
Dec. 31, 2018
USD ($)
action
state
employee
shares
Dec. 31, 2012
employee
Jan. 25, 2019
USD ($)
Dec. 31, 2017
USD ($)
Aug. 31, 2017
state
Ignition Switch Recall Litigations - July 2009 Sale Order [Member]            
Loss Contingencies [Line Items]            
Number of states | state           16
Ignition Switch Recall Litigations - Lost Personal Time and Unjust Enrichment Claims [Member]            
Loss Contingencies [Line Items]            
Number of jurisdictions | jurisdiction 47          
Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Amended and Restated Master Sale and Purchase Agreement [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        
Korea Wage Litigation - Hourly [Member]            
Loss Contingencies [Line Items]            
Number of plaintiffs | employee   10,000        
Number of employees in the case | employee     5      
Reasonably possible loss   $ 590,000,000        
Korea Wage Litigation - Salaried [Member]            
Loss Contingencies [Line Items]            
Reasonably possible loss   170,000,000        
Korea Wage Litigation - Former Subcontract Workers [Member]            
Loss Contingencies [Line Items]            
Reasonably possible loss   $ 150,000,000        
U.S. and Canada [Member] | Ignition Switch Recall Litigations - Economic Damage [Member]            
Loss Contingencies [Line Items]            
Number of pending claims | action   100        
Foreign Tax Authority [Member] | Brazil [Member]            
Loss Contingencies [Line Items]            
Estimated potential recovery from taxing authority   $ 1,300,000,000        
Subsequent Event [Member] | Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Amended and Restated Master Sale and Purchase Agreement [Member]            
Loss Contingencies [Line Items]            
Value of contingently issuable shares       $ 1,200,000,000    
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member]            
Loss Contingencies [Line Items]            
Number of states | state           7
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - Lost Personal Time and Unjust Enrichment Claims [Member]            
Loss Contingencies [Line Items]            
Number of jurisdictions | jurisdiction 41          
Pending Litigation [Member] | Ignition Switch Recall Litigations - Economic Damage [Member]            
Loss Contingencies [Line Items]            
Number of jurisdictions | jurisdiction 27          
Pending Litigation [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member]            
Loss Contingencies [Line Items]            
Number of states | state   8       9
Accrued liabilities and Other liabilities [Member]            
Loss Contingencies [Line Items]            
Litigation-related liability and tax administrative matters   $ 1,300,000,000     $ 930,000,000