RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) - USD ($) $ in Millions	4 Months Ended		8 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2019	Aug. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Benefit Obligation Assumptions:
Discount rate	3.10%	4.09%			3.10%	4.09%
Net Periodic Benefit Cost Assumptions:
Discount rate	3.21%	3.45%	3.21%	3.45%
Assumed long-term rate of return on assets					6.50%	6.50%
Average rate of increase in compensation levels (as a percent)					5.44%	0.00%
Net decrease in pension plan obligations					$ 15
Postretirement Benefits
Benefit Obligation Assumptions:
Discount rate	3.26%	4.29%			3.26%	4.29%
Net Periodic Benefit Cost Assumptions:
Discount rate	3.41%	4.14%	3.41%	3.61%
Assumed long-term rate of return on assets					0.00%	0.00%
Average rate of increase in compensation levels (as a percent)					0.00%	0.00%
Net decrease in postretirement plan obligations					$ 9
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					131
Effect of 1-percent decrease in assumed healthcare cost trend rates on postretirement benefit obligation					103
Effect of 1-percent increase in assumed healthcare cost trend rate on annual service and interest costs					13
Effect of 1-percent decrease in assumed healthcare cost trend rate on annual service and interest costs					$ 9
Postretirement Benefits | MAPD
Assumed healthcare cost trend rates
Projected annual rates of healthcare cost trend rates, year two (as a percent)	9.60%				9.60%
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
Health care cost trend rates for current year (as a percent)	4.30%				4.30%
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent)	(7.70%)				(7.70%)
Postretirement Benefits | MAPD | High end of range
Assumed healthcare cost trend rates
Health care cost trend rates for current year (as a percent)	21.50%				21.50%
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent)	(6.20%)				(6.20%)
Postretirement Benefits | Non-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 | Non-MAPD | Low end of range
Assumed healthcare cost trend rates
Health care cost trend rates for current year (as a percent)	6.70%				6.70%
Postretirement Benefits | Non-MAPD | High end of range
Assumed healthcare cost trend rates
Health care cost trend rates for current year (as a percent)	7.50%				7.50%
Foreign | Low end of range
Net Periodic Benefit Cost Assumptions:
Discount rate					1.00%	1.00%
Average rate of increase in compensation levels (as a percent)					1.00%
Foreign | High end of range
Net Periodic Benefit Cost Assumptions:
Discount rate					8.80%	8.90%
Average rate of increase in compensation levels (as a percent)					8.00%