CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income (loss)	$ 888	$ 740	$ 756
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Equity investee's other comprehensive income after tax	1	1	2
Defined benefit plans:
Prior service costs, net of tax	0	0	(1)
Net actuarial gain (loss), net of tax	(22)	(41)	11
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Qualifying derivatives, net of tax	3	3	2
Defined benefit plans:
Prior service costs, net of tax	1	1	2
Net actuarial (gain) loss, net of tax	(4)	(3)	17
Total other comprehensive income (loss)	(21)	(39)	33
Comprehensive income	$ 867	$ 701	$ 789