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DEBT - Net Carrying Value Of The Convertible Notes (Details) - Convertible Notes - Convertible Senior Notes - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 25, 2017
Debt Instrument [Line Items]    
Principal amount $ 230  
Unamortized debt discount (32)  
Unamortized debt issuance costs (6)  
Long-term Debt 192 $ 197
Equity component, net of issuance costs $ 33 $ 33