CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 100	$ 395	$ 235
Other comprehensive income (loss), net of tax
Marketable securities	21	19	46
Employee benefit plans	54	40	48
Interest rate derivative instruments	(9)	1	(5)
Total other comprehensive income, net of tax	66	60	89
Total Comprehensive Income, net of tax	$ 166	$ 455	$ 324