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Acquisitions, Goodwill, and Acquired Intangible Assets - Expected Future Amortization Expense of Acquired Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Year Ended December 31,    
2021 $ 464  
2022 430  
2023 368  
2024 303  
2025 251  
Thereafter 2,022  
Acquired finite-lived intangible assets, net $ 3,838 $ 4,021