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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net income $ 958 $ 753 $ 2,480 $ 2,245
Other comprehensive income, before tax:        
Pension and other postretirement benefits 6 10 17 31
Other comprehensive income of equity investees 5 0 13 0
Other comprehensive income, before tax 11 10 30 31
Income tax expense related to items of other comprehensive income 0 (3) (5) (8)
Other comprehensive income, net of tax 11 7 25 23
Total comprehensive income $ 969 $ 760 $ 2,505 $ 2,268