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Employee Benefits - Assumptions (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2017
Dec. 31, 2024
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effects created by one percentage point change in assumed healthcare cost trend          
Effect of 1% point increase on postretirement obligation     $ 1    
Effect of 1% point decrease on postretirement obligation     $ (1)    
Retirement Plans          
Benefit obligation          
Discount rate     4.14% 4.47% 4.15%
Net periodic cost          
Return on assets     6.25% 6.25% 7.125%
United States Retirement Plans          
Net periodic cost          
Discount rate     4.47% 4.15% 5.00%
United Kingdom Retirement Plan          
Net periodic cost          
Discount rate     3.84% 3.80% 4.50%
Postretirement Plans          
Benefit obligation          
Discount rate     3.69% 3.90% 3.60%
Net periodic cost          
Weighted-average healthcare cost rate     7.00% 7.00% 7.00%
Discount rate     3.94% 3.60% 4.125%
Subsequent Event | Retirement Plans          
Net periodic cost          
Return on assets 6.25%        
Scenario, 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     $ 14