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Restructuring (Tables) | 12 Months Ended
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Dec. 31, 2017
Restructuring and Related Activities [Abstract] |
Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance | The initial restructuring charge recorded and the ending reserve balance as of December 31, 2017 by segment is as follows:
| 2017 Restructuring Plan |  | 2016 Restructuring Plan
(in millions) | Initial Charge Recorded |  | Ending Reserve Balance |  | Initial Charge Recorded |  | Ending Reserve Balance
Ratings | $ | 25 |  |  | $ | 24 |  |  | $ | 14 |  |  | 4 |
Market and Commodities Intelligence | 9 |  |  | 5 |  |  | 10 |  |  | 3 |
Indices | — |  |  | — |  |  | 1 |  |  | — |
Corporate | 10 |  |  | 10 |  |  | 5 |  |  | 1 |
Total | $ | 44 |  |  | $ | 39 |  |  | $ | 30 |  |  | $ | 8 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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