RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - OBLIGATIONS AND FUNDED STATUS (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 08, 2019	Aug. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in the consolidated balance sheet:
Deferred credits and other liabilities — pension and postretirement obligations			$ (1,807)	$ (809)
Changes in the benefit obligation:
Plan amendments		$ (178)
Pension Benefits
Amounts recognized in the consolidated balance sheet:
Long-term receivables and other assets, net			85	60
Accrued liabilities			(96)	(25)
Deferred credits and other liabilities — pension and postretirement obligations			(704)	(46)
Total amount recognized in consolidated balance sheet			(715)	(11)
Accumulated other comprehensive loss included the following after-tax balances:
Net loss			(25)	91
Prior service cost			0	0
AOCI after-tax balances			(25)	91
Changes in the benefit obligation:
Benefit obligation — beginning of year			349	391
Service cost — benefits earned during the period			45	5	$ 6
Interest cost on projected benefit obligation			39	15	17
Actuarial (gain) loss			(33)	(19)
Foreign currency exchange rate gain			0	(3)
Curtailment (gain) loss			(136)	0
Special termination benefits			49	0
Benefits paid			(95)	(40)
Participant contributions			0	0
Plan amendments			0	0
Additions due to the Acquisition	$ 193		2,136	0
Benefit obligation — end of year			2,354	349	391
Changes in plan assets:
Fair value of plan assets — beginning of year			338	403
Actual return on plan assets			122	(33)
Participant contributions			0	0
Employer contributions			41	8
Benefits paid			(95)	(40)
Additions due to the Acquisition			1,233	0
Fair value of plan assets — end of year			1,639	338	403
Unfunded status:			(715)	(11)
Accumulated Benefit Obligation in Excess of Plan Assets
Projected benefit obligation			2,175	173
Accumulated benefit obligation			1,918	169
Fair value of plan assets			1,375	98
Plan Assets in Excess of Accumulated Benefit Obligation
Projected benefit obligation			179	176
Accumulated benefit obligation			179	176
Fair value of plan assets			264	240
Postretirement Benefits
Amounts recognized in the consolidated balance sheet:
Long-term receivables and other assets, net			0	0
Accrued liabilities			(72)	(45)
Deferred credits and other liabilities — pension and postretirement obligations			(1,103)	(763)
Total amount recognized in consolidated balance sheet			(1,175)	(808)
Accumulated other comprehensive loss included the following after-tax balances:
Net loss			184	151
Prior service cost			(67)	(72)
AOCI after-tax balances			117	79
Changes in the benefit obligation:
Benefit obligation — beginning of year			808	999
Service cost — benefits earned during the period			24	23	21
Interest cost on projected benefit obligation			36	34	38
Actuarial (gain) loss			45	(90)
Foreign currency exchange rate gain			0	0
Curtailment (gain) loss			10	0
Special termination benefits			0	0
Benefits paid			(51)	(57)
Participant contributions			2	0
Plan amendments			0	(101)
Additions due to the Acquisition			301	0
Benefit obligation — end of year			1,175	808	999
Changes in plan assets:
Fair value of plan assets — beginning of year			0	0
Actual return on plan assets			0	0
Participant contributions			2	0
Employer contributions			49	0
Benefits paid			(51)	0
Additions due to the Acquisition			0	0
Fair value of plan assets — end of year			0	0	$ 0
Unfunded status:			$ (1,175)	$ (808)