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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Change in net actuarial loss, tax $ (14) $ (11)
Change in net prior service costs, tax (1) (1)
Unrealized holding loss on interest rate swaps, tax 6  
Foreign currency translation adjustment and other, tax $ (1) $ (14)