CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (76)	$ 172	$ (269)	$ 6
Other comprehensive income (loss), net of tax
Marketable securities	(3)	6	(9)	15
Employee benefit plans	0	2	0	4
Interest rate derivative instruments	4	(2)	7	(8)
Total other comprehensive income (loss), net of tax	1	6	(2)	11
Total Comprehensive Income (Loss), Net of Tax	$ (75)	$ 178	$ (271)	$ 17