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Held for Sale - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Assets held for sale | $ 833 | $ 833 | $ 906 |  |
Liabilities held for sale | 537 | 537 | 683 |  |
Joint Venture |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership interest (percent) |  |  |  |  | 70.00%
Joint Venture | Subsequent Event |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership interest (percent) |  |  |  | 30.00% |
Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Assets held for sale | 833 | 833 |  |  |
Liabilities held for sale | 537 | 537 |  |  |
Held-for-sale | German Pharmaceutical Wholesale Joint Venture |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment | $ 10 | 10 |  |  |
Favorable (unfavorable) cumulative foreign currency translation adjustment |  | $ (11) | $ 3 |  |

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