CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net income (loss)	$ 318	$ 214	$ 915	$ 711
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Qualifying derivatives, amounts arising during the period, net of tax	0	0	1	0
Equity investees' other comprehensive income (loss), net of tax	0	0	0	1
Prior Service Costs, net of tax	0	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]
Defined benefit plan, Net actuarial gain (loss), amounts arising during the period, net of tax	(3)	(4)	(11)	(2)
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Qualifying derivatives, net of tax	1	2	2	3
Other Comprehensive (Income) Loss, Defined Benefit Plans, after Reclassification Adjustment, after Tax [Abstract]
Defined benefit plans, Prior service costs, net of tax	0	0	0
Defined benefit plans, Net actuarial (gain) loss, net of tax	(1)	(1)	(1)	(2)
Total other comprehensive income (loss)	(3)	(3)	(9)	0
Comprehensive income (loss)	$ 315	$ 211	$ 906	$ 711