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Acquisitions and Divestiture (Intangible Assets) (Details) - eVestment $ in Millions | 1 Months Ended | 12 Months Ended
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Oct. 31, 2017 USD ($) | Dec. 31, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 405 |
Customer relationships |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 378 |
Estimated average useful life | 14 years |
Amortization period of intangible assets for tax purposes | 15 years |
Trade name |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 13 |
Estimated average useful life | 8 years | 8 years
Technology |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 14 |
Estimated average useful life | 8 years | 8 years
Discount rate used | Customer relationships |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Discount rate used | 0.093 |
Discount rate used | Trade name |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Discount rate used | 0.092 |
Discount rate used | Technology |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Discount rate used | 0.092 |

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