| **Consolidated Statements of Comprehensive Income - USD ($) $ in Millions**                                                                       | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Statement of Comprehensive Income [Abstract]**                                                                                                  |                 |   |   |   |
| Net income before allocation to noncontrolling interests                                                                                          |                 | $ 2,158 | $ 31,407 | $ 22,025 |
| Foreign currency translation adjustments, net                                                                                                     |                 | 452 | (2,328) | (682) |
| Unrealized holding gains/(losses) on derivative financial instruments, net                                                                        |                 | 626 | 1,444 | 526 |
| Reclassification adjustments for (gains)/losses included in net income                                                                            | [1]             | (413) | (2,062) | 134 |
| Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total                                                            |                 | 213 | (618) | 660 |
| Unrealized holding gains/(losses) on available-for-sale securities, net                                                                           |                 | (121) | (1,306) | (355) |
| Reclassification adjustments for (gains)/losses included in net income                                                                            | [2]             | (141) | 1,809 | (30) |
| Other comprehensive income (loss), available-for-sale securities adjustment, before tax, total                                                    |                 | (261) | 502 | (384) |
| Benefit plans: prior service (costs)/credits and other, net                                                                                       |                 | (25) | (24) | 116 |
| Reclassification adjustments related to amortization of prior service costs and other, net                                                        |                 | (117) | (129) | (154) |
| Reclassification adjustments related to curtailments of prior service costs and other, net                                                        |                 | (15) | (12) | (75) |
| Other comprehensive income (loss), benefit plans, prior service (costs)/credits, before tax, total                                                |                 | (157) | (166) | (113) |
| Other comprehensive income/(loss), before tax                                                                                                     |                 | 246 | (2,609) | (519) |
| Tax provision/(benefit) on other comprehensive income/(loss)                                                                                      |                 | (85) | (187) | 71 |
| Other comprehensive income/(loss), net of tax                                                                                                |                 | 331 | (2,422) | (589) |
| Comprehensive income/(loss) before allocation to noncontrolling interests                                                                         |                 | 2,488 | 28,985 | 21,435 |
| Less: Comprehensive income/(loss) attributable to noncontrolling interests                                                                        |                 | 26 | 20 | 43 |
| Comprehensive income/(loss) attributable to Pfizer Inc.                                                                                           |                 | $ 2,462 | $ 28,965 | $ 21,393 |
|                                                                                                                                                   |
| [1]Reclassified into Other (income)/deductions—net and Cost of sales. See Note 7E.[2]Reclassified into Other (income)/deductions—net. |

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| - Definition
Pre tax adjustment to other comprehensive income for curtailments and settlements, net, related to defined benefit plans prior service (costs)/credits.
+ References
No definition available.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
+ References
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.
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| - Definition
Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.
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| - Definition
Amount before tax, after reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.
+ References
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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| - Definition
Amount of tax expense (benefit) allocated to other comprehensive income (loss).
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| - Definition
Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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