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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (9) $ (56) $ (49) $ (163)
Other comprehensive income (loss):        
Foreign currency translation adjustments 16 (3) 38 12
Comprehensive income (loss) $ 7 $ (59) $ (11) $ (151)