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Acquisitions (2016 Acquisitions) (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2016 | Feb. 29, 2016 | Jun. 30, 2016
ISE |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  |  | $ 1,070
Net assets (liabilities) |  |  | 83
Net deferred tax liability |  |  | 185
Purchase price allocation deferred tax liabilities |  |  | 266
Purchase price allocation deferred tax assets |  |  | 81
Boardvantage |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price | $ 242 |  |
Net assets (liabilities) | 28 |  |
Net deferred tax liability | 45 |  |
Purchase price allocation deferred tax liabilities | 46 |  |
Purchase price allocation deferred tax assets | 1 |  |
Cash paid | 197 |  |
Working capital adjustments | 45 |  |
Credit facility, proceeds | $ 197 |  |
Marketwired |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | $ 111 |
Net assets (liabilities) |  | (1) |
Net deferred tax liability |  | 5 |
Purchase price allocation deferred tax liabilities |  | 10 |
Cash paid |  | 109 |
Working capital adjustments |  | 2 |
Credit facility, proceeds |  | 109 |
Measurement period adjustment |  |  | $ 5
Nasdaq CXC |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | 116 |
Net assets (liabilities) |  | 6 |
Net deferred tax liability |  | 20 |
Cash paid |  | 115 |
Working capital adjustments |  | 1 |
Revolving Credit Facility | Nasdaq CXC |  |  |
Business Acquisition [Line Items] |  |  |
Credit facility, proceeds |  | $ 55 |

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