SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Plants, Property and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Other Significant Noncash Transactions [Line Items]
Accumulated depreciation	$ 3,200		$ 3,200		$ 3,100
Depreciation	$ 27	$ 28	79	$ 79
Non-cash additions			21
Property, Plant and Equipment [Member]
Other Significant Noncash Transactions [Line Items]
Non-cash additions			$ 12		$ 15