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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 768 $ 737 $ 1,518 $ 790
Other comprehensive income (loss), before tax:        
Pension and other postretirement expense 0 (11) 0 (13)
Other comprehensive income of equity investees 0 1 1 1
Other comprehensive income (loss), before tax 0 (10) 1 (12)
Income tax benefit related to items of other comprehensive income 0 2 0 2
Other comprehensive income (loss), net of tax 0 (8) 1 (10)
Total comprehensive income $ 768 $ 729 $ 1,519 $ 780