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Acquisitions and Divestitures - Acquisitions Narrative (Details) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) sector | Aug. 31, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2016 | Aug. 31, 2015 USD ($) | Aug. 18, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net of cash acquired |  | $ 83,000,000 | $ 177,000,000 | $ 2,400,000,000 |  |  |  |  |
Payments for previous acquisition |  | $ 0 | $ 39,000,000 | $ 5,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization period for intangible assets (in years) |  |  |  | 18 years |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 2,000,000,000.0 | $ 2,000,000,000.0
Algomi Limited |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost method investment ownership percentage |  |  |  |  | 6.02% |  |  |  |
CARE Ratings Limited |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost method investment ownership percentage |  |  |  |  |  | 8.90% |  |  |
Investments |  |  |  |  |  | $ 54,000,000 |  |  |
Kensho Technologies |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cost method investment ownership percentage |  |  | 2.54% |  |  |  |  |  |
TRIS Rating Company Limited |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 49.00% |  |
PIRA Energy Group |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments for previous acquisition |  |  | $ 34,000,000 |  |  |  |  |  |
UCG |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments for previous acquisition |  |  | $ 5,000,000 | $ 5,000,000 |  |  |  |  |
SNL Financial LC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of business acquired | $ 2,200,000,000 |  |  |  |  |  |  |  |
Number of sectors in global economy served by acquiree | sector |  |  |  | 5 |  |  |  |  |
Acquisition-related costs |  |  |  | $ 37,000,000 |  |  |  |  |
SNL Financial LC | Minimum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  |  | 10 years |  |  |  |  |
SNL Financial LC | Maximum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  |  | 18 years |  |  |  |  |
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 |  |  |  |  |  |

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