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Divestitures - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 18, 2017 | Nov. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Aug. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain from sale of business, pre-tax |  |  | $ 0 | $ 109 | $ 0 | $ 109 |  |
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
Goodwill |  |  |  |  |  |  | $ 124 |
Assets |  |  |  |  |  |  | 243 |
Liabilities |  |  |  |  |  |  | $ 190 |
Other |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  | $ 61 |  |  |  |  |  |
Pre-tax gain on sale of equity method investments |  |  | 56 |  | 56 |  |  |
After-tax gain on sale of equity method investments |  |  | $ 41 |  | $ 41 |  |  |
Cash consideration received after exercising option under the agreement |  | 23 |  |  |  |  |  |
Portion of proceeds used to obtain equity interest in new entity |  | $ 38 |  |  |  |  |  |
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 |  | 43 |  |
After-tax gain on sale of equity method investments |  |  |  | $ 26 |  | $ 26 |  |

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