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Divestitures - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 18, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Aug. 01, 2017
Enterprise Information Solutions |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain from sale of business, pre-tax |  | $ 109 |  |
Gain from sale of business, after tax |  | $ 30 |  |
Enterprise Information Solutions | Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price agreed to for sell of EIS business |  |  |  | $ 185
Assets |  |  | $ 243 |
Goodwill |  |  | 124 |
Liabilities |  |  | 190 |
European Pharmaceutical Solutions |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of equity method investment | $ 42 |  |  |
Pre-tax gain on sale of equity method investments |  |  | 43 |
After-tax gain on sale of equity method investments |  |  | $ 26 |

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