CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 395	$ 235	$ 58
Other comprehensive income (loss), net of tax
Marketable securities, net of tax	19	46	(76)
Employee benefit plans, net of tax	40	48	(67)
Interest rate derivative instruments, net of tax	1	(5)	17
Other comprehensive income (loss)	60	89	(126)
Comprehensive income	$ 455	$ 324	$ (68)