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Acquisition-related Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Future Amortization Expense [Abstract]    
2018 $ 1,705  
2019 1,698  
2020 1,609  
2021 1,510  
2022 1,383  
2023 and Thereafter 7,505  
Definite-Lived Intangible Assets, Net $ 15,410 $ 12,628