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Acquisitions and Divestiture (2017 Acquisitions) (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 6,369 | $ 6,586
eVestment |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | $ 744 |  |
Total Net Liabilities Acquired | (10) |  |
Total Net Deferred Tax Liability | (104) |  |
Acquired Intangible Assets | 405 |  |
Goodwill | 453 |  |
Cash consideration | 705 |  |
Acquisition of businesses, net of cash and cash equivalents acquired | 22 |  |
Purchase price allocation deferred tax assets | 39 |  |
Purchase price allocation deferred tax liabilities | $ 143 |  |

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