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Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
2018 (remaining nine months) $ 902  
2019 1,089  
2020 1,064  
2021 1,064  
2022 1,064  
Thereafter 8,870  
Total $ 14,053 $ 14,350