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Acquisitions and Divestitures - Divestitures Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) business | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Assets held-for-sale |  |  |  |  |  |  |  |  | $ 5
Pre-tax gain (loss) on dispositions |  |  |  | $ 379 | $ 722 | $ 1,100 |  |  |
Gain (loss) on disposition of business, net of tax |  |  |  | $ 297 | $ 521 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions |  |  |  |  |  |  | $ 1,100 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Quant House SAS |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions | $ (31) |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Equity Research |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions |  | $ 9 |  |  |  |  |  |  |
Gain (loss) on disposition of business, net of tax |  | 5 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | SPSE and CMA |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions |  | 364 |  |  |  |  |  |  |
Gain (loss) on disposition of business, net of tax |  | $ 297 |  |  |  |  |  |  |
Number of businesses disposed | business |  | 2 |  |  |  |  |  |  |
Cash proceeds from sale of business |  | $ 425 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | J.D. Power |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions |  |  | $ 728 |  |  |  |  |  |
Gain (loss) on disposition of business, net of tax |  |  | 516 |  |  |  |  |  |
Cash proceeds from sale of business |  |  | $ 1,100 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | McGraw Hill Construction |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on dispositions |  |  |  |  |  |  |  | $ 11 |

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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