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Employee Benefits - Assumptions (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2024
Effects created by one percentage point change in assumed healthcare cost trend            
Effect of 1% point increase on postretirement obligation     $ 0      
Effect of 1% point decrease on postretirement obligation     $ 0      
United States Retirement Plans            
Net periodic cost            
Discount rate     4.13% 4.47%    
United Kingdom Retirement Plan            
Net periodic cost            
Discount rate     2.58% 3.84%    
Retirement Plans            
Benefit obligation            
Discount rate   4.14% 3.68% 4.14% 4.47%  
Net periodic cost            
Return on assets 6.25% 6.00% 6.25% 6.25% 6.25%  
Retirement Plans | United States Retirement Plans            
Net periodic cost            
Discount rate     4.13% 4.47% 4.15%  
Retirement Plans | United Kingdom Retirement Plan            
Net periodic cost            
Discount rate     2.58% 3.84% 3.80%  
Postretirement Plans            
Benefit obligation            
Discount rate   3.69% 3.40% 3.69% 3.90%  
Net periodic cost            
Weighted-average healthcare cost rate   7.00% 7.00% 7.00% 7.00%  
Discount rate     3.69% 3.94% 3.60%  
Forecast | Postretirement Plans            
Net periodic cost            
Weighted-average healthcare cost rate           5.00%
Change in Accounting Method Accounted for as Change in Estimate            
Net periodic cost            
Decrease in pension and postretirement medical costs     $ 10 $ 14