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Goodwill and Intangible Assets - Intangible Asset Amortization Expense, Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fiscal year:    
Remaining 2018 $ 31  
2019 49  
2020 34  
Thereafter 0  
Intangible Assets, Net 123 $ 69
Finite-Lived Intangible Assets, Amortization Expense, Year Four $ 9