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Assets and Liabilities Held for Sale - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of goodwill, acquired intangibles and other assets |  | $ 340 | $ 76 | $ 340 |
Goodwill, impairment loss |  | 318 | 57 | 318 |
Impairment of intangible assets, indefinite-lived (excluding goodwill) |  | $ 22 | 19 | $ 22 |
Marketing Applications | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenue |  |  | 69 |  |
Operating loss |  |  | 112 |  |
Impairment of goodwill, acquired intangibles and other assets |  |  | 76 |  |
Goodwill, impairment loss |  |  | 57 |  |
Goodwill |  |  | 57 |  | $ 113
Impairment of intangible assets, indefinite-lived (excluding goodwill) |  |  | $ 19 |  |
Affiliated Entity | Marketing Applications | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration to be received from disposal of a segment | $ 90 |  |  |  |
Proceeds from sale of business | $ 92 |  |  |  |

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