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Commitments and Contingencies Ignition Switch Recall (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Jan. 27, 2017
Ignition Switch Recall Litigations [Member]      
Loss Contingencies [Line Items]      
State Attorney General, Number   49  
Ignition Switch Recall Litigations - Shareholder Class Action [Member]      
Loss Contingencies [Line Items]      
Litigation Settlement, Amount   $ 300  
Number of Shareholders Opting Out of Settlement   1  
Ignition Switch Recall Litigations - Investigation by the Office [Member]      
Loss Contingencies [Line Items]      
Loss Contingency, Damages Paid, Value $ 900    
Prosecution Deferral Period 3 years    
Period after the expiration of the period of deferral 30 days    
Prosecution Deferral Period Extension 1 year    
Maximum Prosecution Deferral Period 4 years    
Monitor's Authority Period 3 years    
Monitor's Extension Period 1 year    
NEW YORK | Ignition Switch Recall Litigations - Multidistrict Litigation [Member]      
Loss Contingencies [Line Items]      
Claims Scheduled for Trial, Number   8  
Claims Settled, Number   5  
Claims Dismissed, Number   3  
Subsequent Event [Member] | Ignition Switch Recall Litigations - Civil Actions [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number     2
Subsequent Event [Member] | U.S. | Ignition Switch Recall Litigations - Economic Damage [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number     100
Subsequent Event [Member] | U.S. | Ignition Switch Recall Litigations - Injury or Death [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number     284
Subsequent Event [Member] | CANADA | Ignition Switch Recall Litigations - Economic Damage [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number     21
Subsequent Event [Member] | CANADA | Ignition Switch Recall Litigations - Injury or Death [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number     14
Consolidated Litigation [Member] | DELAWARE | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]      
Loss Contingencies [Line Items]      
Claims Dismissed, Number   4  
Consolidated Litigation [Member] | Wayne County, Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number   2  
Consolidated Litigation [Member] | Eastern District of Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]      
Loss Contingencies [Line Items]      
Pending Claims, Number   3