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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 478 $ 958 $ 1,300 $ 2,480
Other comprehensive income (loss), before tax:        
Pension and other postretirement benefit (expense) (6) 6 (17) 17
Other comprehensive income (loss) of equity investees (1) 5 (1) 13
Other comprehensive income (loss), before tax (7) 11 (18) 30
Income tax benefit (expense) related to items of other comprehensive income (loss) 2 0 5 (5)
Other comprehensive income (loss), net of tax (5) 11 (13) 25
Total comprehensive income $ 473 $ 969 $ 1,287 $ 2,505