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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 737 $ 356 $ 790 $ 822
Other comprehensive loss, before tax:        
Pension and other postretirement expense (11) (6) (13) (11)
Other comprehensive income of equity investees 1 1 1 0
Other comprehensive loss, before tax (10) (5) (12) (11)
Income tax benefit related to items of other comprehensive loss 2 1 2 3
Other comprehensive loss, net of tax (8) (4) (10) (8)
Total comprehensive income $ 729 $ 352 $ 780 $ 814