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Commitments and Contingencies Litigation-Related Liability and Tax Administrative Matters (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
jurisdiction
action
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2018
USD ($)
action
case
employee
shareholder
shares
Dec. 31, 2016
USD ($)
Oct. 12, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
state
Aug. 31, 2017
state
Loss Contingencies [Line Items]                
Maximum liability, guarantees $ 6,000,000,000   $ 6,000,000,000       $ 5,100,000,000  
Indirect Tax Matters [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss 900,000,000   $ 900,000,000          
Texas state (MDL) [Member] | Pending Litigation [Member]                
Loss Contingencies [Line Items]                
Number of additional bellwether trials | case     2          
Brazil [Member] | Foreign Tax Authority [Member]                
Loss Contingencies [Line Items]                
Estimated potential recovery $ 1,200,000,000   $ 1,200,000,000          
Ignition Switch Recall Litigations - Economic-loss cases [Member]                
Loss Contingencies [Line Items]                
Number of pending claims | action 100   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 Unjust Enrichment Claims [Member]                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 47              
Ignition Switch Recall Litigations - Lost Personal Time and Unjust Enrichment Claims [Member] | Granted Motion to Dismiss [Member]                
Loss Contingencies [Line Items]                
Number of jurisdictions | jurisdiction 41              
Ignition Switch Recall Litigations - Shareholder Class Action [Member]                
Loss Contingencies [Line Items]                
Litigation settlement amount       $ 300,000,000        
Number of shareholders filing an appeal | shareholder     1          
Ignition Switch Recall Litigations - Investigation by the Office [Member]                
Loss Contingencies [Line Items]                
Damages paid   $ 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          
Estimate of possible loss $ 580,000,000   $ 580,000,000          
Korea Wage Litigation - Salaried [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss 160,000,000   160,000,000          
Korea Wage Litigation - Former Subcontract Workers [Member]                
Loss Contingencies [Line Items]                
Estimate of possible loss 150,000,000   150,000,000          
Accrued liabilities and Other liabilities [Member]                
Loss Contingencies [Line Items]                
Estimated litigation liability 1,400,000,000   1,400,000,000       $ 930,000,000  
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   $ 35,000,000,000.0          
Contingently issuable shares (in shares) | shares 30,000,000   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         $ 1,000,000,000