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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 01, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 2,989 | $ 2,949 | $ 2,882 |
SNL Financial LC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  |  |  | $ 29
Property, plant and equipment |  |  |  | 19
Goodwill |  |  |  | 1,574
Other intangible assets, net |  |  |  | 772
Other non-current assets |  |  |  | 1
Total assets acquired |  |  |  | 2,395
Current liabilities |  |  |  | (43)
Unearned revenue |  |  |  | (117)
Other non-current liabilities |  |  |  | (1)
Total liabilities acquired |  |  |  | (161)
Net assets acquired |  |  |  | 2,234
SNL Financial LC | Databases and software |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets, net |  |  |  | 421
SNL Financial LC | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets, net |  |  |  | 162
SNL Financial LC | Tradenames |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets, net |  |  |  | 185
SNL Financial LC | Other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets, net |  |  |  | $ 4

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