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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
Statement of Comprehensive Income [Abstract]        
Net income $ 711 $ 1,099 $ 2,229 $ 1,889
Other comprehensive income (loss), before tax:        
Pension and other postretirement expense 0 (2) 0 (15)
Other comprehensive income (loss) of equity investees (1) 0 0 1
Other comprehensive loss, before tax (1) (2) 0 (14)
Income tax benefit related to items of other comprehensive income 0 0 0 2
Other comprehensive loss, net of tax (1) (2) 0 (12)
Total comprehensive income $ 710 $ 1,097 $ 2,229 $ 1,877