Acquisitions, Divestitures, Equity-Method Investments, Collaborative Arrangements, Research and Development Arrangements and In-Licensing Arrangements - Change in the Carrying Value of Equity Method Investment (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 29, 2024 |
Jun. 30, 2024 |
Dec. 31, 2024 |
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| Schedule of Equity Method Investments [Line Items] | ||||||||||||||||
| Reclassification of accumulated other comprehensive income balances in Equity-method investments | [1] | $ (143) | ||||||||||||||
| Transfer of carrying value to Short-term investments | [2] | (5,411) | ||||||||||||||
| Ending carrying value | 217 | |||||||||||||||
| Haleon [Member] | ||||||||||||||||
| Schedule of Equity Method Investments [Line Items] | ||||||||||||||||
| Beginning carrying value reported in Equity-method investments | 11,451 | |||||||||||||||
| Carrying value of shares sold | (6,113) | |||||||||||||||
| Dividends | (212) | |||||||||||||||
| Currency translation adjustments and other | [3] | 341 | ||||||||||||||
| Basis difference adjustments and amortization | [4],[5] | (91) | ||||||||||||||
| Pfizer share of Haleon investee capital transaction | $ 46 | $ (91) | (44) | [4],[6] | ||||||||||||
| Pfizer share of Haleon earnings | [4] | 224 | ||||||||||||||
| Ending carrying value | $ 0 | |||||||||||||||
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