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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net income (loss) $ 1,181 $ 888 $ 740
Amounts arising during the period - gains (losses), net of tax (expense) benefit:      
Qualifying derivatives, net of tax 1 0 0
Equity investee's other comprehensive income after tax (1) 1 1
Defined benefit plans:      
Prior service costs, net of tax 0 0 0
Net actuarial gain (loss), net of tax (20) (22) (41)
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):      
Qualifying derivatives, net of tax 2 3 3
Defined benefit plans:      
Prior service costs, net of tax 1 1 1
Net actuarial (gain) loss, net of tax (1) (4) (3)
Total other comprehensive income (loss) (18) (21) (39)
Comprehensive income $ 1,163 $ 867 $ 701