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Acquisitions (Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016 | May 31, 2016 | Feb. 29, 2016 | Jan. 30, 2015
ISE |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 623 |  | $ 623 |  |  |
Boardvantage |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | 111 |  |  | $ 111 |  |
Marketwired |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | 31 |  |  |  | $ 31 |
Nasdaq CXC |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 76 |  |  |  | $ 76 |
DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | $ 141 |  |  |  | $ 141
Customer relationships |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization period of intangible assets for tax purposes | 15 years |  |  |  |  |
Customer relationships | ISE |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 148 |  |  |  |  |
Discount rate used | 9.10% |  |  |  |  |
Estimated average remaining useful life | 13 years |  |  |  |  |
Customer relationships | Boardvantage |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 103 |  |  |  |  |
Discount rate used | 15.50% |  |  |  |  |
Estimated average remaining useful life | 14 years |  |  |  |  |
Customer relationships | Marketwired |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 29 |  |  |  |  |
Discount rate used | 16.40% |  |  |  |  |
Estimated average remaining useful life | 6 years |  |  |  |  |
Customer relationships | Nasdaq CXC |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 76 |  |  |  |  |
Discount rate used | 10.30% |  |  |  |  |
Estimated average remaining useful life | 17 years |  |  |  |  |
Customer relationships | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | $ 29 |  |  |  |
Discount rate used |  | 17.50% |  |  |  |
Estimated average remaining useful life |  | 15 years |  |  |  |
Technology | Boardvantage |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 6 |  |  |  |  |
Discount rate used | 15.50% |  |  |  |  |
Estimated average remaining useful life | 5 years |  |  |  |  |
Technology | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | $ 4 |  |  |  |
Discount rate used |  | 17.00% |  |  |  |
Estimated average remaining useful life |  | 5 years |  |  |  |
Exchange registrations | ISE |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 467 |  |  |  |  |
Discount rate used | 8.60% |  |  |  |  |
Trade name | ISE |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 8 |  |  |  |  |
Discount rate used | 8.60% |  |  |  |  |
Trade name | Boardvantage |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 2 |  |  |  |  |
Discount rate used | 15.00% |  |  |  |  |
Estimated average remaining useful life | 1 year |  |  |  |  |
Trade name | Marketwired |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 2 |  |  |  |  |
Discount rate used | 15.80% |  |  |  |  |
Estimated average remaining useful life | 2 years |  |  |  |  |
Trade name | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired intangible assets |  | $ 108 |  |  |  |
Discount rate used |  | 17.00% |  |  |  |
Income Approach Valuation Technique | Trade name | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization period of intangible assets for tax purposes | 15 years |  |  |  |  |
Income Approach Valuation Technique | Minimum | Customer relationships | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Customer relationships intangible assets, period of growth | 3 years |  |  |  |  |
Income Approach Valuation Technique | Maximum | Customer relationships | DWA |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Customer relationships intangible assets, period of growth | 6 years |  |  |  |  |

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