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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 819 $ 392 $ 1,492 $ 773
Other comprehensive income, before tax:        
Pension and other postretirement benefits 10 6 21 13
Other comprehensive income of equity investees 0 1 0 6
Other comprehensive income, before tax 10 7 21 19
Income tax expense related to items of other comprehensive income (2) (1) (5) (3)
Other comprehensive income, net of tax 8 6 16 16
Total comprehensive income $ 827 $ 398 $ 1,508 $ 789