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Acquisitions and Divestitures - Divestitures Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Pre-tax gain (loss) on dispositions |  | $ 49 |
Assets held-for-sale |  |  | $ 5
Disposal Group, Disposed of by Sale, Not Discontinued Operations | RigData |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Pre-tax gain (loss) on dispositions | $ 27 |  |
After-tax gain (loss) on disposition | 26 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Standard & Poor's Investment Advisory Services LLC |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Pre-tax gain (loss) on dispositions | 22 |  |
After-tax gain (loss) on disposition | $ 12 |  |

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