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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ (502) $ 116 $ 147
Other comprehensive loss:      
Foreign currency translation adjustments (89) (45) (18)
Comprehensive income (loss) $ (591) $ 71 $ 129