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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ 52 $ (52) $ (234)
Other comprehensive income (loss):      
Foreign currency translation adjustments (38) 37 (8)
Comprehensive income (loss) $ 14 $ (15) $ (242)