CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 73	$ 236	$ 79	$ 324
Other comprehensive income (loss), net of tax
Marketable securities	5	20	20	25
Employee benefit plans	1	3	5	9
Interest rate derivative instruments	(1)	(4)	(9)	(3)
Total other comprehensive income, net of tax	5	19	16	31
Total Comprehensive Income, Net of Tax	$ 78	$ 255	$ 95	$ 355