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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 2,013 $ 2,722 $ 2,666
Other comprehensive income (loss), before tax:      
Pension and other postretirement benefits (140) 101 (148)
Other comprehensive income (loss) of equity investees 2 (4) (9)
Other comprehensive income (loss), before tax (138) 97 (157)
Income tax benefit (expense) related to items of other comprehensive income (loss) 35 (25) 38
Other comprehensive income (loss), net of tax (103) 72 (119)
Total comprehensive income $ 1,910 $ 2,794 $ 2,547