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Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
2019 (remaining nine months) $ 851  
2020 1,125  
2021 1,125  
2022 1,125  
2023 1,125  
Thereafter 8,045  
Total $ 13,396 $ 13,694