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Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
2018 $ 1,203  
2019 1,088  
2020 1,064  
2021 1,064  
2022 1,064  
Thereafter 8,867  
Total $ 14,350 $ 8,971