SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Plants, Property and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Other Significant Noncash Transactions [Line Items]
Accumulated depreciation	$ 4,000		$ 3,900
Depreciation	33	$ 33
Property, Plant and Equipment [Member]
Other Significant Noncash Transactions [Line Items]
Non-cash additions	$ 11		$ 20