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Acquisitions and Divestitures - Acquisitions Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2018 | Jan. 31, 2018 | Aug. 31, 2017 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired |  | $ 91 | $ 401 |  |  |  |  |
Cash paid for acquisitions, net of cash acquired |  |  |  | $ 83 |  |  |  |
FiscalNote |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cost method investment ownership interest (as a percent) |  |  |  |  | 5.03% |  |  |
Kensho Technologies |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired | $ 550 |  |  |  |  |  |  |
Pragmatix Services Private Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership in equity method investment (as a percent) |  |  |  |  |  | 100.00% |  |
Algomi Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cost method investment ownership interest (as a percent) |  |  |  |  |  |  | 6.02% |
CARE Ratings Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cost method investment ownership interest (as a percent) |  |  |  |  |  |  |  | 8.90%
Series of Individually Immaterial Business Acquisitions | Minimum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  | 3 years |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  | 10 years | 10 years |  |  |  |  |

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