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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 ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) store
Segment Reporting [Abstract] |  |  |  |
Operating income (GAAP measure) |  | $ 13,743 | $ 7,954 | $ 13,310
Amortization of intangible assets |  | 1,905 | 1,785 | 2,233
Net realized capital (gains) losses |  | 497 | 320 | (176)
Acquisition-related integration costs |  | 487 | 0 | 132
Restructuring charges |  | 507 | 0 | 0
Office real estate optimization charges | $ 117 | 46 | 117 | 0
Loss on assets held for sale |  | 349 | 2,533 | 0
Opioid litigation charges |  | 0 | 5,803 | 0
Gain on divestiture of subsidiaries |  | 0 | (475) | 0
Store impairments |  | 0 | 0 | 1,358
Goodwill impairment |  | 0 | 0 | 431
Acquisition purchase price adjustments outside of measurement period |  | 0 | 0 | (61)
Adjusted operating income |  | $ 17,534 | $ 18,037 | $ 17,227
Number of stores, planned closure | store |  |  |  | 900

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