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Goodwill and Acquired Intangible Assets (Estimated Future Amortization Expense) (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 72
2018 90
2019 76
2020 75
2021 74
2022 and thereafter 536
Total $ 923