CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 180	$ 171	$ 155
Other Comprehensive Income :
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $0, $0 and $2, respectively	0	2	9
Total other comprehensive income	0	2	9
Comprehensive income	$ 180	$ 173	$ 164