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Intangible Assets, Net Intangible Assets, Net (Details 2) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Definite-lived intangible assets, future amortization expense disclosure    
2015 (remaining six months) $ 8  
2016 8  
2017 5  
2018 3  
2019 2  
Net carrying amount, definite-lived intangible assets $ 26 $ 29