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Divestitures (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Jul. 18, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Aug. 01, 2017
Discontinued Operations Disclosures |  |  |  |  |  |  |  |  |  |
Gain from sale of equity method investment, pre-tax |  |  |  |  |  |  | $ 43 | $ 0 | $ 0 |
Distribution Solutions |  |  |  |  |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  | $ 42 |  |  |  |  |  |  |  |
Gain from sale of equity method investment, pre-tax |  |  |  | $ 43 |  |  |  |  |  |
Gain from sale of equity method investment, after tax |  |  |  | $ 26 |  |  |  |  |  |
Distribution Solutions | ZEE Medical Business | Operating Segments |  |  |  |  |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  | $ 52 |  |  |  | 52 |
Gain from sale of business, after tax |  |  |  |  | 29 |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  |  | $ 134 |  |  |  |  |
Technology Solutions | Nurse Triage | Operating Segments |  |  |  |  |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  | $ 51 |  |  | $ 51 |
Gain from sale of business, after tax |  |  |  |  |  | 38 |  |  |  |
Proceeds from divestiture of businesses |  |  |  |  |  | $ 84 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Enterprise Information Solutions |  |  |  |  |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |  |  |  |  |
Consideration agreed upon for sale of business |  |  |  |  |  |  |  |  |  | $ 185
Net cash proceeds received | $ 169 |  |  |  |  |  |  |  |  |
Assumed net debt | $ 16 |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  | $ 109 |  |  |  |  |  |  |
Gain from sale of business, after tax |  |  | $ 30 |  |  |  |  |  |  |

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