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Acquisitions, Divestitures and Asset Sales - Narrative (Details) $ / shares in Units, member in Thousands, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2023 USD ($) | May 01, 2023 USD ($) | Feb. 21, 2023 USD ($) | Feb. 28, 2023 USD ($) | Nov. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) member | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 02, 2023 USD ($) $ / shares | Mar. 29, 2023 USD ($) $ / shares | May 31, 2022 member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt | $ 4,900 | $ 5,000 | $ 6,000 | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortization since acquisition date |  |  |  |  |  |  |  |  |  |  | $ 1,905 | $ 1,785 | $ 2,233 |  |  |
Stock-based compensation expense since acquisition date |  |  |  |  |  |  |  |  |  |  | 588 | 447 | 484 |  |  |
Loss on assets held for sale |  |  |  |  |  |  |  |  |  |  | 349 | 2,533 | 0 |  |  |
Gain (loss) on sale of subsidiaries |  |  |  |  |  |  |  |  |  |  | 0 | 475 | $ 0 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | International Health Care Renewal Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of international health care members, renewal rights sold | member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200
Health Care Benefits | Disposal Group, Disposed of by Sale, Not Discontinued Operations | bswift LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of subsidiary |  |  |  |  | $ 735 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |
Health Care Benefits | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Payflex |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of subsidiary |  |  |  |  |  | $ 775 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 225 |  |  |  |
Health Care Benefits | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Thailand Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on assets held for sale |  |  |  |  |  |  |  | $ 41 |  |  |  |  |  |  |  |
Number of medical members | member |  |  |  |  |  |  |  | 266 |  |  |  |  |  |  |  |
Pharmacy & Consumer Wellness | Disposal Group, Held-for-sale, Not Discontinued Operations | Omnicare Long-Term Care Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on assets held for sale |  |  |  |  |  |  | $ 349 |  |  |  |  | $ 2,500 |  |  |  |
Oak Street Health Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Cash to be received by shareholders in acquisition (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39.00 |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 796 |  |
Revenue since acquisition date |  |  |  |  |  |  |  |  | $ 2,100 |  |  |  |  |  |  |
Operating income (losses) since acquisition date |  |  |  |  |  |  |  |  | (520) |  |  |  |  |  |  |
Intangible asset amortization since acquisition date |  |  |  |  |  |  |  |  | 193 |  |  |  |  |  |  |
Stock-based compensation expense since acquisition date |  |  |  |  |  |  |  |  | $ 71 |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  | 77 |  |  |  |  |
Signify Health, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Cash to be received by shareholders in acquisition (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.50 |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 259 |
Revenue since acquisition date |  |  |  |  |  |  |  |  |  | $ 797 |  |  |  |  |  |
Operating income (losses) since acquisition date |  |  |  |  |  |  |  |  |  | 123 |  |  |  |  |  |
Intangible asset amortization since acquisition date |  |  |  |  |  |  |  |  |  | 106 |  |  |  |  |  |
Stock-based compensation expense since acquisition date |  |  |  |  |  |  |  |  |  | $ 72 |  |  |  |  |  |
Goodwill deductible for income tax purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700 |
Transaction costs |  |  |  |  |  |  |  |  |  |  | $ 37 |  |  |  |  |

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