SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Plants, Property and Equipment, Net (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Other Significant Noncash Transactions [Line Items]
Accumulated depreciation	$ 3,900,000,000		$ 3,900,000,000		$ 3,600,000,000
Depreciation	$ 37,000,000	$ 33,000,000	103,000,000	$ 97,000,000
Property, Plant and Equipment [Member]
Other Significant Noncash Transactions [Line Items]
Non-cash additions			16,000,000		12,000,000
Forestlands [Member]
Other Significant Noncash Transactions [Line Items]
Non-cash additions			$ 0		$ 10,000,000