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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income $ 3,005 $ 2,013 $ 2,722
Other comprehensive income (loss), before tax:      
Pension and other postretirement benefits 226 (140) 101
Other comprehensive income (loss) of equity investees 24 2 (4)
Other comprehensive income (loss), before tax 250 (138) 97
Income tax expense related to items of other comprehensive income (58) 35 (25)
Other comprehensive income (loss), net of tax 192 (103) 72
Total comprehensive income $ 3,197 $ 1,910 $ 2,794