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Goodwill and Intangible Assets - Expected Future Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 47  
2017 33  
2018 10  
2019 0  
2020 0  
Thereafter 0  
Intangible assets, net $ 90 $ 133