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Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Fair Value of Plan Assets at beginning of year $ 377  
Fair Value of Plan Assets at end of year 362 $ 377
Level 3    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Fair Value of Plan Assets at beginning of year 46  
Fair Value of Plan Assets at end of year 51 46
Real Estate Trust Funds    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Fair Value of Plan Assets at beginning of year 13  
Fair Value of Plan Assets at end of year 24 13
Real Estate Trust Funds | Level 3    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 2 1
Purchases, Sales, and Settlements 9 6
Spin-Off of Delphi Technologies   (23)
Foreign currency translation and other 0 0
Fair Value of Plan Assets at beginning of year 13 29
Fair Value of Plan Assets at end of year 24 13
Hedge Funds    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Fair Value of Plan Assets at beginning of year 27  
Fair Value of Plan Assets at end of year 21 27
Hedge Funds | Level 3    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 0 2
Purchases, Sales, and Settlements (4) 0
Spin-Off of Delphi Technologies   (84)
Foreign currency translation and other (2) 2
Fair Value of Plan Assets at beginning of year 27 107
Fair Value of Plan Assets at end of year 21 27
Insurance Contracts    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Fair Value of Plan Assets at beginning of year 6  
Fair Value of Plan Assets at end of year 6 6
Insurance Contracts | Level 3    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 0 1
Purchases, Sales, and Settlements 0 0
Spin-Off of Delphi Technologies   0
Foreign currency translation and other 0 0
Fair Value of Plan Assets at beginning of year 6 5
Fair Value of Plan Assets at end of year $ 6 $ 6