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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Comprehensive Income [Abstract]        
Unrealized losses on derivatives, tax $ 0 $ 5 $ 1 $ 5
Pension and postretirement gains, tax (5) 0 26 (1)
Reclassification to income of realized (gains) losses on derivatives, tax $ 0 $ 0 $ (1) $ 0