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Acquisition and Assets Held for Sale - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 02, 2023 | May 01, 2023 | Mar. 29, 2023 | Feb. 21, 2023 | Feb. 28, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  | $ 6,000 | $ 6,000 |  |  |
Loss on assets held for sale |  |  |  |  |  | $ 349 | $ 41 |
Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from debt |  | $ 5,000 |  |  |  |  |  |
Signify Health, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 100.00% |  |  |  |  |
Cash to be received by shareholders in proposed acquisition (in dollars per share) |  |  | $ 30.50 |  |  |  |  |
Total value of proposed acquisition |  |  | $ 7,353 |  |  |  |  |
Goodwill deductible for income tax purposes |  |  | 1,700 |  |  |  |  |
Deferred income taxes |  |  | $ 256 |  |  |  |  |
Transaction costs |  |  |  |  |  | 37 |  |
Oak Street Health Inc. | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |  |
Cash to be received by shareholders in proposed acquisition (in dollars per share) | $ 39.00 |  |  |  |  |  |  |
Total value of proposed acquisition | $ 10,600 |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Omnicare Long-Term Care Business | Pharmacy & Consumer Wellness |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Loss on assets held for sale |  |  |  |  |  | $ 349 |  | $ 2,500

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