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Goodwill and Acquired Intangible Assets (Estimated Future Amortization Expense) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2022 $ 161
2023 157
2024 152
2025 149
2026 146
2027+ 864
Total $ 1,629