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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) store | Dec. 31, 2020 USD ($) | Aug. 31, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (GAAP measure) |  | $ 7,746 | $ 13,193 | $ 13,911 |
Amortization of intangible assets |  | 1,808 | 2,259 | 2,341 |
Office real estate optimization charges | $ 117 | 117 | 0 | 0 |
Gain on divestiture of subsidiaries |  | (475) | 0 | (269) |
Opioid litigation charges |  | 5,803 | 0 | 0 |
Loss on assets held for sale |  | 2,533 | 0 | 0 |
Acquisition-related integration costs |  | 0 | 132 | 332 |
Store impairments |  | 0 | 1,358 | 0 |
Goodwill impairment |  | 0 | 431 | 0 |
Acquisition purchase price adjustments outside of measurement period |  | 0 | (61) | 0 |
Receipt of fully reserved ACA risk corridor receivable |  | 0 | 0 | (307) |
Adjusted operating income |  | $ 17,532 | $ 17,312 | 16,008 |
Number of stores, planned closure | store |  |  | 900 |  |
U.S. Department of Health and Human Services, ACA Risk Corridor Receivables | Settled Litigation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain contingency, unrecorded amount |  |  |  | 313 | $ 313
Former gain contingency, recognized in current period, before tax |  |  |  | $ 307 |

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