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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits            
Benefit Obligation Assumptions:            
Discount rate 4.09% 3.45%     4.09% 3.45%
Net Periodic Benefit Cost Assumptions:            
Discount rate 3.45% 3.90% 3.45% 3.90%    
Assumed long-term rate of return on assets         6.50% 6.50%
Net decrease in pension plan obligations         $ 1  
Postretirement Benefits            
Benefit Obligation Assumptions:            
Discount rate 4.29% 3.61%     4.29% 3.61%
Net Periodic Benefit Cost Assumptions:            
Discount rate 4.14% 4.15% 3.61% 4.15%    
Assumed long-term rate of return on assets         0.00% 0.00%
Net decrease in postretirement plan obligations         $ 1  
Assumed healthcare cost trend rates            
Consumer Price Index (CPI) increase (as a percent)           1.97%
Projected annual rates of healthcare cost trend rates (as a percent) 8.00%       8.00%  
Projected ultimate healthcare cost trend rates (as a percent) 4.50%       4.50%  
Projected annual rates of healthcare cost trend rates, thereafter (as a percent) 4.50%       4.50%  
Effect of 1-percent increase or a 1-percent decrease in these assumed healthcare cost trend rates            
Effect of 1-percent increase in assumed healthcare cost trend rates on postretirement benefit obligation         $ 102  
Effect of 1-percent decrease in assumed healthcare cost trend rates on postretirement benefit obligation         82  
Effect of 1-percent increase in assumed healthcare cost trend rate on annual service and interest costs         10  
Effect of 1-percent decrease in assumed healthcare cost trend rate on annual service and interest costs         $ 8  
Postretirement Benefits | MAPD            
Assumed healthcare cost trend rates            
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) 4.50%       4.50%  
Postretirement Benefits | MAPD | Low end of range            
Assumed healthcare cost trend rates            
Projected annual rates of healthcare cost trend rates (as a percent) 22.00%       22.00%  
Projected annual rates of healthcare cost trend rates, year two (as a percent) 6.00%       6.00%  
Postretirement Benefits | MAPD | High end of range            
Assumed healthcare cost trend rates            
Projected annual rates of healthcare cost trend rates (as a percent) 34.00%       34.00%  
Projected annual rates of healthcare cost trend rates, year two (as a percent) 10.00%       10.00%  
Postretirement Benefits | Non-MAPD            
Assumed healthcare cost trend rates            
Projected ultimate healthcare cost trend rates (as a percent) 7.75%       7.75%  
Projected annual rates of healthcare cost trend rates, year seven and beyond (as a percent) 4.50%       4.50%  
Foreign Pension Plans | Low end of range            
Net Periodic Benefit Cost Assumptions:            
Discount rate         1.00%  
Average rate of increase in compensation levels (as a percent)         1.00%  
Foreign Pension Plans | High end of range            
Net Periodic Benefit Cost Assumptions:            
Discount rate         8.90% 10.80%
Average rate of increase in compensation levels (as a percent)         8.00%