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, 2019
Dec. 31, 2018
Rate
Dec. 31, 2017
Rate
Dec. 31, 2016
Rate
Other Postretirement Benefit Plan        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   4.25% 3.55%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   3.55% 4.00% 4.35%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates        
Annual rate of increase in the per capita cost of covered health care benefits   7.63%    
Ultimate per capita trend rate for health care costs   5.00%    
UNITED STATES        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   4.36% 3.66%  
Cash balance crediting rate (as a percent)   4.03% 4.27%  
Compensation increase rate (as a percent)   3.00% 2.99%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   3.66% 4.12% 4.47%
Expected return on plan assets (as a percent)   6.50% 7.25% 7.50%
Compensation increase rate (as a percent)   3.00% 4.87% 4.87%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
UNITED STATES | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   7.00%    
UNITED STATES | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   2.00%    
UNITED STATES | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.00%    
UNITED STATES | Equity Securities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   15.00%    
UNITED STATES | Real estate        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.50%    
UNITED STATES | Private equity / venture capital        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.50%    
UNITED STATES | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   4.00%    
UNITED STATES | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   68.00%    
Asset allocation covers exposure to changes in portion of discount rate (as a percent)   100.00%    
UNITED KINGDOM        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   2.80% 2.55%  
Cash balance crediting rate (as a percent)   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)   2.55% 2.70% 3.95%
Expected return on plan assets (as a percent)   4.00% 4.50% 4.70%
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   23.00%    
UNITED KINGDOM | Real estate        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
UNITED KINGDOM | Reinsurance        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   8.00%    
UNITED KINGDOM | Corporate Credit Instruments        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   7.50%    
UNITED KINGDOM | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   56.50%    
Asset allocation covers exposure to changes in portion of discount rate (as a percent)   80.00%    
Minimum | UNITED STATES | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   2.00%    
Minimum | UNITED STATES | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | UNITED STATES | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   3.00%    
Minimum | UNITED STATES | Real estate        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | UNITED STATES | Private equity / venture capital        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | UNITED STATES | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | UNITED STATES | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   63.00%    
Maximum | UNITED STATES | Defined Benefit Plan, Equity Securities, US        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   12.00%    
Maximum | UNITED STATES | Non-U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
Maximum | UNITED STATES | Global Equities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   9.00%    
Maximum | UNITED STATES | Real estate        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | UNITED STATES | Private equity / venture capital        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | UNITED STATES | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | UNITED STATES | Fixed Income Funds        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   73.00%    
Scenario, Forecast | UNITED STATES        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 6.25%      
Scenario, Forecast | UNITED KINGDOM        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 4.00%