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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]      
Net income (loss) $ 537 $ 1,046 $ (2,643)
Change in value of pension and other postretirement liabilities:      
Amortization of prior service cost and net loss included in net periodic pension cost [2] 10 2 13
Net loss incurred in period [3] (2) (13) (7)
Total change in value of pension and postretirement liabilities 8 (11) 6
Change in currency translation adjustment   6 3
Comprehensive income (loss) $ 545 $ 1,041 $ (2,634)
[1] In 2018 and 2017, deferred tax activity incurred in other comprehensive income was offset by a valuation allowance.
[2] Net of $8 million in taxes for the year ended December 31, 2016.
[3] Net of ($4) million in taxes for the year ended December 31, 2016.