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Acquisition and Divestiture - Divestiture of Brazilian Subsidiary (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) building | Sep. 30, 2019 USD ($) building | Sep. 30, 2018 USD ($) | Jul. 01, 2019 store
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of stores | building | 9,900 | 9,900 |  |
Loss on divestiture | $ |  | $ (205) | $ (86) |
Retail Long-Term Care Segment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of stores | building | 9,900 | 9,900 |  |
Retail Long-Term Care Segment | Brazil Subsidiary | Discontinued Operations, Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of stores | store |  |  |  | 50
Loss on divestiture | $ | $ 205 |  |  |

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