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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 356 $ 819 $ 822 $ 1,522
Other comprehensive income (loss), before tax:        
Pension and other postretirement benefit (expense) (6) 5 (11) 11
Other comprehensive income of equity investees 1 2 0 8
Other comprehensive income (loss), before tax (5) 7 (11) 19
Income tax benefit (expense) related to items of other comprehensive income (loss) 1 (1) 3 (5)
Other comprehensive income (loss), net of tax (4) 6 (8) 14
Total comprehensive income $ 352 $ 825 $ 814 $ 1,536