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Divestitures (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jul. 01, 2019 store
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  | $ 834 | $ 0 |
Gain (loss) on divestiture, pretax |  | $ 271 | $ (205) | 271 | $ (205) |
Discontinued Operations, Disposed of by Sale | Coventry Health Care Workers Compensation business | Health Care Benefits |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of subsidiary | $ 850 |  |  |  |  |
Gain (loss) on divestiture, pretax |  | 271 |  | $ 271 |  |
Discontinued Operations, Disposed of by Sale | Drogaria onofre Ltda. | Retail/ LTC |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of retail pharmacy stores | store |  |  |  |  |  | 50
Gain (loss) on divestiture, pretax |  | $ (205) |  |  |  |

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