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, 2024
Rate
Dec. 31, 2023
Rate
Dec. 31, 2022
Rate
Dec. 31, 2021
Rate
UNITED STATES        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   5.15% 5.55%  
Cash balance crediting rate   4.55% 4.56%  
Compensation increase rate (as a percent)   5.34% 5.35%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   5.55% 3.31% 2.62%
Expected return on plan assets (as a percent)   7.00% 6.50% 6.25%
Compensation increase rate (as a percent)   5.35% 2.71% 2.72%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
Asset allocation covers exposure to changes in portion of discount rate (as a percent)   100.00%    
UNITED STATES | U.S. equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   8.00%    
UNITED STATES | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   3.00%    
UNITED STATES | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED STATES | Equity Securities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   16.00%    
UNITED STATES | Real Assets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED STATES | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED STATES | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   3.00%    
UNITED STATES | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   71.00%    
UNITED KINGDOM        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   4.72% 4.99%  
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)   4.99% 2.26% 1.50%
Expected return on plan assets (as a percent)   5.00% 4.01% 4.00%
Compensation increase rate (as a percent)   3.75% 3.75% 3.75%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
UNITED KINGDOM | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   1.00%    
UNITED KINGDOM | Real Assets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   8.00%    
UNITED KINGDOM | Private Markets        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED KINGDOM | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   78.00%    
Hedged Exposure to Interest Rates   79.00%    
Hedged Exposure to Inflation   79.00%    
UNITED KINGDOM | Credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED KINGDOM | Diversified strategies        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   1.00%    
UNITED KINGDOM | Cash        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   2.00%    
Other Postretirement Benefit Plan        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   5.19% 5.59%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   5.59% 2.93% 2.30%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates        
Annual rate of increase in the per capita cost of covered health care benefits   6.75%    
Scenario, Forecast | UNITED STATES        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 7.25%      
Scenario, Forecast | UNITED KINGDOM        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 5.00%      
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%