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Acquisitions (Intangible Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Feb. 29, 2016
Customer relationships |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period of intangible assets for tax purposes | 15 years |  |  |  |
ISE |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 623 | $ 623 |  |
ISE | Customer relationships |  |  |  |  |
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 |  |  |
ISE | Exchange registrations |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 467 |  |  |
Discount rate used |  | 8.60% |  |  |
ISE | Trade name |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 8 |  |  |
Discount rate used |  | 8.60% |  |  |
Boardvantage |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 111 |  | $ 111 |
Boardvantage | Customer relationships |  |  |  |  |
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 |  |  |
Boardvantage | Technology |  |  |  |  |
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 |  |  |
Boardvantage | Trade name |  |  |  |  |
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 |  |  |
Marketwired |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 31 |  |  | $ 31
Marketwired | Customer relationships |  |  |  |  |
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 |  |  |
Marketwired | Trade name |  |  |  |  |
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 |  |  |
Nasdaq CXC |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 76 |  |  | $ 76
Nasdaq CXC | Customer relationships |  |  |  |  |
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 |  |  |

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