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Commitments and Contingencies Ignition Switch Recall (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
Dec. 31, 2017
USD ($)
state
attorney_general
action
case
employee
shareholder
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2012
employee
Sep. 01, 2017
case
Aug. 31, 2017
state
Aug. 04, 2017
case
Ignition Switch Recall Litigations [Member]                
Loss Contingencies [Line Items]                
Number of state Attorney Generals | attorney_general     49          
Ignition Switch Recall Litigations - July 2009 Sale Order [Member]                
Loss Contingencies [Line Items]                
Number of states | state             16  
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          
Ignition Switch Recall Litigations - Shareholder Class Action [Member]                
Loss Contingencies [Line Items]                
Litigation settlement amount       $ 300,000,000        
Number of shareholders who have filed an appeal | shareholder     1          
Ignition Switch Recall Litigations - Investigation by the Office [Member]                
Loss Contingencies [Line Items]                
Amount of damages paid $ 900,000,000              
Prosecution deferral period 3 years              
Period after the expiration of the period of deferral 30 days              
Prosecution potential extension of deferral period   1 year            
Maximum deferral period   4 years            
Monitor's authority period   3 years            
Monitor's extension period   1 year            
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     $ 592,000,000          
Korea Wage Litigation - Salaried [Member]                
Loss Contingencies [Line Items]                
Reasonably possible loss     $ 185,000,000          
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     $ 1,400,000,000          
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member]                
Loss Contingencies [Line Items]                
Number of states | state             7  
Pending Litigation [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member]                
Loss Contingencies [Line Items]                
Number of states | state     8       9  
Consolidated Litigation [Member] | Wayne County, Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]                
Loss Contingencies [Line Items]                
Number of pending claims | case     2          
Consolidated Litigation [Member] | Eastern District of Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]                
Loss Contingencies [Line Items]                
Number of pending claims | case     3          
Consolidated Litigation with Denied Dismissal [Member] | Eastern District of Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]                
Loss Contingencies [Line Items]                
Number of pending claims | case               2
Judicial Ruling [Member] | Korea Wage Litigation - Salaried, Case One [Member]                
Loss Contingencies [Line Items]                
Number of claims remanded | case           1    
Judicial Ruling [Member] | Korea Wage Litigation - Salaried, Case Two [Member]                
Loss Contingencies [Line Items]                
Number of claims remanded | case           1    
Accrued liabilities and Other liabilities [Member]                
Loss Contingencies [Line Items]                
Litigation-related liability and tax administrative matters     $ 930,000,000 $ 1,200,000,000