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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Net loss $ (409) $ (1,411) $ (1,760) $ (2,995)
Net income (loss) attributable to noncontrolling interest   6 (6) 21
Net loss attributable to controlling interest (409) (1,417) (1,754) (3,016)
Components of net periodic benefit costs before reclassifications (1)   (4) (2)
Components of net periodic benefit costs reclassified to net income 2 4 4 12
Other comprehensive income (loss) before income taxes 1 4   10
Income taxes related to other comprehensive income (loss)   (2)   (25)
Other comprehensive income (loss) 1 2   (15)
Other comprehensive income (loss) attributable to controlling interest 1 2   (15)
Total comprehensive loss (408) (1,409) (1,760) (3,010)
Total comprehensive income (loss) attributable to noncontrolling interest   6 (6) 21
Total comprehensive loss attributable to controlling interest $ (408) $ (1,415) $ (1,754) $ (3,031)