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Goodwill and Intangible Assets - Intangible Asset Amortization Expense, Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Fiscal year:    
Remaining 2017 $ 33  
2018 38  
2019 14  
2020 7  
Thereafter 0  
Intangible Assets, Net $ 92 $ 102