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Goodwill and Intangible Assets - Intangible Asset Amortization Expense, Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Amortization Expense, Fiscal Year Maturity [Abstract]    
Remaining 2015 $ 77  
2016 116  
2017 64  
2018 23  
2019 3  
Thereafter 0  
Intangible Assets, Net $ 283 $ 305