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Acquisition-related Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Future Amortization Expense [Abstract]    
2019 $ 1,691  
2020 1,610  
2021 1,496  
2022 1,348  
2023 1,273  
2024 and Thereafter 6,293  
Definite-Lived Intangible Assets, Net $ 13,711 $ 15,410