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Divestitures and Assets Held for Sale (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Initial Ownership Interest Before Sale |  |  |  | 98.00%
China Pharmaceutical and Medical Products Distribution Business [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from Divestiture of Businesses |  |  | $ 861 |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities |  | $ 59 | 59 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | 41 |
naviHealth [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities |  | 38 | $ 38 |
Provisional tax benefit related to transaction |  | $ 12 |  |
Subsequent Event | naviHealth [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from Divestiture of Businesses | $ 736 |  |  |
Initial Ownership Interest Before Sale | 98.00% |  |  |
Ownership interest in Partnership | 44.00% |  |  |
Partnership Indirect Ownership | 100.00% |  |  |

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