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Goodwill and Acquired Intangible Assets (Estimated Future Amortization Expense) (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 83
2021 109
2022 106
2023 100
2024 97
2025 and thereafter 603
Total $ 1,098