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Debt Obligations (2014 Credit Facility) (Details) - Revolving Credit Facility - USD ($) | 12 Months Ended |
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Dec. 31, 2016 | Nov. 30, 2014
$750 million revolving credit commitment due November 25, 2019 |  |
Debt Instrument [Line Items] |  |
Credit facility, borrowing capacity | $ 750,000,000 | $ 750,000,000
Credit facility, proceeds | 898,000,000 |
Repayments of credit facility | 1,156,000,000 |
$750 million revolving credit commitment due November 25, 2019 | Nasdaq CXC, Marketwired and Boardvantage |  |
Debt Instrument [Line Items] |  |
Credit facility, proceeds | 361,000,000 |
$750 million revolving credit commitment due November 25, 2019 for corporate use |  |
Debt Instrument [Line Items] |  |
Credit facility, proceeds | $ 537,000,000 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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