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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 753 $ 569 $ 2,245 $ 1,342
Other comprehensive income, before tax:        
Pension and other postretirement benefits 10 7 31 20
Other comprehensive income of equity investees 0 0 0 6
Other comprehensive income, before tax 10 7 31 26
Income tax expense related to items of other comprehensive income (3) (3) (8) (6)
Other comprehensive income, net of tax 7 4 23 20
Total comprehensive income $ 760 $ 573 $ 2,268 $ 1,362