RELATED PARTIES - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	Oct. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) a
Related Party Transaction [Line Items]
Current restricted financial investments held by variable interest entities (Note 8)				$ 253	$ 362	$ 253
Proceeds from note receivable held by variable interest entities			$ 253
Payments related to SPE liabilities		$ 302		$ 209
Interest expense					378	375	$ 393
Proceeds from sale of Southern timberlands					297	0	203
Gain on sale of timberlands					48	0	99
Buyer-sponsored SPEs
Related Party Transaction [Line Items]
Interest income					22	34	34
Interest expense					$ 12	$ 29	$ 29
Weighted average interest rate on SPE financial investments					5.50%	5.50%
Monetization SPEs
Related Party Transaction [Line Items]
Weighted average interest rate on SPE long-term notes					5.60%	5.60%
Twin Creeks Venture
Related Party Transaction [Line Items]
Ownership interest	21.00%
Proceeds from redemption of ownership interest in related party	$ 108
Sale of Timberland acreage | a							100,000
Proceeds from sale of Southern timberlands							$ 203
Gain on sale of timberlands							$ 99
Twin Creeks Venture | Mississippi
Related Party Transaction [Line Items]
Sale of Timberland acreage | a							80,000
Twin Creeks Venture | Georgia
Related Party Transaction [Line Items]
Sale of Timberland acreage | a							20,000