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Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Fair Value of Plan Assets at beginning of year $ 1,212  
Fair Value of Plan Assets at end of year 377 $ 1,212
Level 3    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Fair Value of Plan Assets at beginning of year 141  
Fair Value of Plan Assets at end of year 46 141
Real Estate Trust Funds    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Fair Value of Plan Assets at beginning of year 29  
Fair Value of Plan Assets at end of year 13 29
Real Estate Trust Funds | Level 3    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 1 4
Purchases, Sales, and Settlements 6 (10)
Spin-Off of Delphi Technologies (23)  
Foreign currency translation and other 0 (4)
Fair Value of Plan Assets at beginning of year 29 39
Fair Value of Plan Assets at end of year 13 29
Hedge Funds    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Fair Value of Plan Assets at beginning of year 107  
Fair Value of Plan Assets at end of year 27 107
Hedge Funds | Level 3    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 2 22
Purchases, Sales, and Settlements 0 0
Spin-Off of Delphi Technologies (84)  
Foreign currency translation and other 2 (17)
Fair Value of Plan Assets at beginning of year 107 102
Fair Value of Plan Assets at end of year 27 107
Insurance Contracts    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Fair Value of Plan Assets at beginning of year 5  
Fair Value of Plan Assets at end of year 6 5
Insurance Contracts | Level 3    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 1 0
Purchases, Sales, and Settlements 0 4
Spin-Off of Delphi Technologies 0  
Foreign currency translation and other 0 0
Fair Value of Plan Assets at beginning of year 5 1
Fair Value of Plan Assets at end of year $ 6 $ 5