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Acquisitions (Acquisition of Businesses) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Feb. 29, 2016
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 6,070 | $ 6,027 |  |  |
ISE |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase Consideration |  |  | $ 1,070 |  |
Total Net Assets (Liabilities) Acquired |  |  | 83 |  |
Total Net Deferred Tax Liability |  |  | (185) |  |
Acquired Intangible Assets |  | 623 | 623 |  |
Goodwill |  |  | $ 549 |  |
Boardvantage |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase Consideration |  |  |  | $ 242 |
Total Net Assets (Liabilities) Acquired |  |  |  | 28 |
Total Net Deferred Tax Liability |  |  |  | (45) |
Acquired Intangible Assets |  | 111 |  | 111 |
Goodwill |  |  |  | $ 148 |
Marketwired |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase Consideration |  |  |  |  | $ 111
Total Net Assets (Liabilities) Acquired |  |  |  |  | (1)
Total Net Deferred Tax Liability |  |  |  |  | (5)
Acquired Intangible Assets |  | 31 |  |  | 31
Goodwill |  |  |  |  | 86
Nasdaq CXC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase Consideration |  |  |  |  | 116
Total Net Assets (Liabilities) Acquired |  |  |  |  | 6
Total Net Deferred Tax Liability |  |  |  |  | (20)
Acquired Intangible Assets |  | $ 76 |  |  | 76
Goodwill |  |  |  |  | $ 54

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