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Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Fair Value of Plan Assets at beginning of year $ 1,209  
Fair Value of Plan Assets at end of year 1,212 $ 1,209
Level 3    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Fair Value of Plan Assets at beginning of year 142  
Fair Value of Plan Assets at end of year 141 142
Real Estate Trust Funds    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Fair Value of Plan Assets at beginning of year 39  
Fair Value of Plan Assets at end of year 29 39
Real Estate Trust Funds | Level 3    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 4 (3)
Purchases, Sales, and Settlements (10) 2
Foreign currency translation and other (4) (1)
Fair Value of Plan Assets at beginning of year 39 41
Fair Value of Plan Assets at end of year 29 39
Hedge Funds    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Fair Value of Plan Assets at beginning of year 102  
Fair Value of Plan Assets at end of year 107 102
Hedge Funds | Level 3    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 22 5
Purchases, Sales, and Settlements 0 0
Foreign currency translation and other (17) (5)
Fair Value of Plan Assets at beginning of year 102 102
Fair Value of Plan Assets at end of year 107 102
Insurance Contracts    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Fair Value of Plan Assets at beginning of year 1  
Fair Value of Plan Assets at end of year 5 1
Insurance Contracts | Level 3    
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]    
Actual Return on Plan Assets Still Held at the Reporting Date 0 0
Purchases, Sales, and Settlements 4 0
Foreign currency translation and other 0 0
Fair Value of Plan Assets at beginning of year 1 1
Fair Value of Plan Assets at end of year $ 5 $ 1