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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (17) $ (44) $ (40) $ (107)
Other comprehensive income (loss):        
Foreign currency translation adjustments 12 (8) 22 15
Comprehensive loss $ (5) $ (52) $ (18) $ (92)