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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 1,099 $ 478 $ 1,889 $ 1,300
Other comprehensive loss, before tax:        
Pension and other postretirement expense (2) (6) (15) (17)
Other comprehensive income (loss) of equity investees 0 (1) 1 (1)
Other comprehensive loss, before tax (2) (7) (14) (18)
Income tax benefit related to items of other comprehensive loss 0 2 2 5
Other comprehensive loss, net of tax (2) (5) (12) (13)
Total comprehensive income $ 1,097 $ 473 $ 1,877 $ 1,287