| **Earnings Per Common Share Attributable to Common Shareholders (Details) - USD ($) shares in Millions, $ in Millions**                                                                                                                                        | 3 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **EPS Numerator––Basic**                                                                                                                                                                                                                           |                |   |   |
| Income from continuing operations                                                                                                                                                                                                                              | [1]            | $ 3,410 | $ 3,889 |
| Less: Net income attributable to noncontrolling interests                                                                                                                                                                                                      |                | 9 | 6 |
| Income from continuing operations attributable to Pfizer Inc.                                                                                                                                                                                                  |                | 3,401 | 3,884 |
| Less: Preferred stock dividends––net of tax                                                                                                                                                                                                        |                | 0 | 0 |
| Income from continuing operations attributable to Pfizer Inc. common shareholders                                                                                                                                                                              |                | 3,401 | 3,883 |
| Discontinued operations––net of tax                                                                                                                                                                                                                | [1]            | 0 | 0 |
| Net income attributable to Pfizer Inc. common shareholders                                                                                                                                                                                                     |                | 3,401 | 3,883 |
| **EPS Numerator––Diluted**                                                                                                                                                                                                                         |                |   |   |
| Income from continuing operations attributable to Pfizer Inc. common shareholders and assumed conversions                                                                                                                                                      |                | 3,401 | 3,884 |
| Discontinued operations––net of tax, attributable to Pfizer Inc. common shareholders and assumed conversions                                                                                                                                       |                | 0 | 0 |
| Net income attributable to Pfizer Inc. common shareholders and assumed conversions                                                                                                                                                                             |                | $ 3,401 | $ 3,884 |
| **EPS Denominator**                                                                                                                                                                                                                                            |                |   |   |
| Weighted-average number of common shares outstanding––Basic (shares)                                                                                                                                                                               | [1]            | 5,545 | 5,635 |
| Common-share equivalents: stock options, stock issuable under employee compensation plans and convertible preferred stock (shares)                                                                                                                             |                | 68 | 115 |
| Weighted-average number of common shares outstanding––Diluted (shares)                                                                                                                                                                             | [1]            | 5,613 | 5,750 |
| Equity Option [Member]                                                                                                                                                                                                                                         |                |   |   |
| **EPS Denominator**                                                                                                                                                                                                                                            |                |   |   |
| Anti-dilutive common stock equivalents (shares)                                                                                                                                                                                                                | [2]            | 3 | 2 |
|                                                                                                                                                                                                                                                                |
| [1]Amounts may not add due to rounding.[2]These common stock equivalents were outstanding for the periods presented, but were not included in the computation of diluted EPS for those periods because their inclusion would have had an anti-dilutive effect. |

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| - Definition
This element represents the income or loss from continuing operations available to common stockholders which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests and preferred stock dividends declared or paid in the period, if any.
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| - Definition
This element represents the income or loss from continuing operations available to common stockholders which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests and preferred stock dividends declared or paid in the period, if any.
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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.
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| - Definition
Amount after tax of income (loss) from continuing operations attributable to the parent.
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Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.
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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.
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| - Definition
Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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| - Definition
Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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| - Definition
Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.
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| - Definition
Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.
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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.
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| - Definition
The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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