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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income $ 673 $ 381
Other comprehensive income, before tax:    
Pension and other postretirement benefits 11 7
Other comprehensive income, before tax 11 12
Income tax expense related to items of other comprehensive income (3) (2)
Other comprehensive income, net of tax 8 10
Total comprehensive income 681 391
Accumulated Other Comprehensive Loss Equity Investees    
Other comprehensive income, before tax:    
Other comprehensive income, before tax $ 0 $ 5