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Goodwill and Acquired Intangible Assets (Amortization Expense) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2021 $ 615
2022 596
2023 534
2024 518
2025 512
Thereafter 7,139
Net Carrying Value 9,914
Indefinite-lived intangible assets $ 77