Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - ASSUMPTIONS AND PLAN ASSET TARGETS (Details 3)

v3.8.0.1
PENSION AND OTHER POSTRETIREMENT BENEFITS - ASSUMPTIONS AND PLAN ASSET TARGETS (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Postretirement Benefit Plan        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   3.55% 4.00%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   4.00% 4.35% 3.90%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]        
Annual rate of increase in the per capita cost of covered health care benefits   8.00%    
Ultimate per capita trend rate for health care costs   5.00%    
Increase in APBO due to increase of one percent   $ 16    
Increase in net periodic other postretirement benet expense due to incease in health care cost trend rates of one percent   1    
Decrease in APBO due to decrease in health care cost rends of one percent   14    
Decrease in net periodic other postretirement benefit expense due to decrease in health care cost trends of one percent   $ 1    
UNITED STATES        
Assumptions Used in Determining the Pension Benefit Obligation        
Discount rate PBO (as a percent)   3.66% 4.12%  
Compensation increase rate (as a percent)   2.99% 4.87%  
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Discount rate net periodic benefit cost (as a percent)   4.12% 4.47% 4.07%
Expected return on plan assets (as a percent)   7.25% 7.50% 7.50%
Compensation increase rate (as a percent)   4.87% 4.87% 4.88%
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
UNITED STATES | U.S. Equity        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
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   8.00%    
UNITED STATES | Equity Securities        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   20.00%    
UNITED STATES | Real estate        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   6.00%    
UNITED STATES | Private equity / venture capital        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   4.00%    
UNITED STATES | Opportunistic credit        
Target Allocations        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   2.00%    
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)   2.55% 2.70%  
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)   2.70% 3.95% 3.80%
Expected return on plan assets (as a percent)   4.50% 4.70% 5.80%
Compensation increase rate (as a percent)   3.75% 3.75% 4.25%
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)   79.00%    
Maximum | UNITED STATES | U.S. Equity        
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%    
Minimum | UNITED STATES | U.S. Equity        
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%    
Scenario, Forecast | UNITED STATES        
Assumptions Used in Determining the Net Periodic Pension Cost and OPEB        
Expected return on plan assets (as a percent) 6.50%      
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%