Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 3) - Assumptions and Plan Asset Targets

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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 3) - Assumptions and Plan Asset Targets
 12 Months Ended
Jan. 01, 2020
Rate
Dec. 31, 2019
Rate
Dec. 31, 2018
Rate
Dec. 31, 2017
Rate
Other Postretirement Benefit Plan        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   3.15% 4.25%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   4.25% 3.55% 4.00%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates        
Annual rate of increase in the per capita cost of covered health care benefits   7.25%    
U.S. PENSION PLAN        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   3.36% 4.36%  
Cash balance crediting rate   4.11% 4.03%  
Compensation increase rate (as a percent)   2.73% 3.00%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   4.36% 3.66% 4.12%
Expected return on plan assets (as a percent)   6.25% 6.50% 7.25%
Compensation increase rate (as a percent)   2.73% 3.00% 4.87%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
U.S. PENSION PLAN | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
U.S. PENSION PLAN | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   1.00%    
U.S. PENSION PLAN | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.00%    
U.S. PENSION PLAN | Equity Securities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   12.00%    
U.S. PENSION PLAN | Real Assets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.00%    
U.S. PENSION PLAN | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.00%    
U.S. PENSION PLAN | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   4.00%    
U.S. PENSION PLAN | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   72.00%    
Asset allocation covers exposure to changes in portion of discount rate (as a percent)   100.00%    
U.K. PENSION PLAN        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   2.00% 2.80%  
Cash balance crediting rate   0.00% 0.00%  
Compensation increase rate (as a percent)   3.75% 3.75%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   2.80% 2.55% 2.70%
Expected return on plan assets (as a percent)   4.00% 4.00% 4.50%
Compensation increase rate (as a percent)   3.75% 3.75% 3.75%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
U.K. PENSION PLAN | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
U.K. PENSION PLAN | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   18.00%    
U.K. PENSION PLAN | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   55.50%    
Asset allocation covers exposure to changes in portion of discount rate (as a percent)   80.00%    
U.K. PENSION PLAN | Credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   7.50%    
U.K. PENSION PLAN | Diversifying strategies        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   8.00%    
U.K. PENSION PLAN | Cash        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   1.00%    
Minimum | U.S. PENSION PLAN | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | U.S. PENSION PLAN | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | U.S. PENSION PLAN | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   3.00%    
Minimum | U.S. PENSION PLAN | Real Assets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | U.S. PENSION PLAN | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | U.S. PENSION PLAN | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | U.S. PENSION PLAN | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   67.00%    
Maximum | U.S. PENSION PLAN | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | U.S. PENSION PLAN | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   4.00%    
Maximum | U.S. PENSION PLAN | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   9.00%    
Maximum | U.S. PENSION PLAN | Real Assets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | U.S. PENSION PLAN | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | U.S. PENSION PLAN | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | U.S. PENSION PLAN | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   77.00%    
Scenario, Forecast | Other Postretirement Benefit Plan        
Defined Benefit Plan, Assumed Health Care Cost Trend Rates        
Ultimate per capita trend rate for health care costs 5.00%      
Scenario, Forecast | U.S. PENSION PLAN        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 6.25%      
Scenario, Forecast | U.K. PENSION PLAN        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 4.00%