| **CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 3 Months Ended | 6 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Statement of Comprehensive Income [Abstract]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                |           |   |   |  |   |  |
| Net income before allocation to noncontrolling interests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1],[2]        | $ 2,035        | $ 2,635 | $ 5,061 | [3] | $ 5,017 | [3] |
| Foreign currency translation adjustments, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | [1]            | 514            | (327) | 581 |  | (1,635) |  |
| Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [1]            | 514            | (327) | 581 |  | (1,635) |  |
| Unrealized holding gains/(losses) on derivative financial instruments, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | [1]            | (571)          | 452 | (845) |  | 137 |  |
| Reclassification adjustments for realized (gains)/losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1],[4]        | 469            | (743) | 130 |  | (510) |  |
| Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [1]            | (102)          | (291) | (714) |  | (373) |  |
| Unrealized holding gains/(losses) on available-for-sale securities, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | [1]            | 350            | (200) | 479 |  | (527) |  |
| Reclassification adjustments for realized (gains)/losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1],[4]        | (226)          | 498 | (16) |  | 745 |  |
| Other comprehensive income (loss), available-for-sale securities adjustment, before tax, total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | [1]            | 124            | 299 | 463 |  | 218 |  |
| Benefit plans: actuarial gains/(losses), net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | [1]            | (19)           | (9) | (19) |  | 22 |  |
| Reclassification adjustments related to amortization                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | [1],[5]        | 139            | 134 | 278 |  | 269 |  |
| Reclassification adjustments related to settlements, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1],[5]        | 22             | 22 | 48 |  | 62 |  |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | [1]            | (57)           | (29) | (18) |  | 130 |  |
| Defined benefit plan, amounts recognized in other comprehensive income (loss), net gain (loss), before tax, total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | [1]            | 85             | 118 | 288 |  | 483 |  |
| Benefit plans: prior service credits and other, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | [1]            | 87             | 507 | 87 |  | 506 |  |
| Reclassification adjustments related to amortization                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | [1],[5]        | (41)           | (34) | (81) |  | (69) |  |
| Reclassification adjustments related to curtailments, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | [1],[5]        | 0              | (7) | (6) |  | (17) |  |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | [1]            | 1              | (2) | 6 |  | (2) |  |
| Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | [1]            | 48             | 464 | 6 |  | 418 |  |
| Other comprehensive income/(loss), before tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | [1]            | 669            | 263 | 624 |  | (890) |  |
| Tax provision/(benefit) on other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | [1],[6]        | 36             | 228 | (5) |  | 332 |  |
| Other comprehensive income/(loss) before allocation to noncontrolling interests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | [1]            | 633            | 35 | 629 |  | (1,222) |  |
| Comprehensive income before allocation to noncontrolling interests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | [1]            | 2,668          | 2,670 | 5,690 |  | 3,795 |  |
| Less: Comprehensive income/(loss) attributable to noncontrolling interests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | [1]            | 21             | 8 | 24 |  | (3) |  |
| Comprehensive income attributable to Pfizer Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | [1]            | $ 2,647        | $ 2,663 | $ 5,666 |  | $ 3,797 |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [1]Amounts may not add due to rounding.[2]Amounts may not add due to rounding.[3]Amounts may not add due to rounding.[4]Reclassified into Other (income)/deductions—net in the condensed consolidated statements of income.[5]Generally reclassified, as part of net periodic pension cost, into Cost of sales, Selling, informational and administrative expenses, and/or Research and development expenses, as appropriate, in the condensed consolidated statements of income. For additional information, see Note 10. Pension and Postretirement Benefit Plans.[6]See Note 5C. Tax Matters: Tax Provision/(Benefit) on Other Comprehensive Income/(Loss). |

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Pre tax adjustment to other comprehensive income for curtailments and settlements, net, related to defined benefit plans prior service (costs)/credits.
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Pre tax adjustment to other comprehensive income for other adjustments related to defined benefit plans prior service (costs)/credits.
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Pre tax adjustment to other comprehensive income for other adjustments related to defined benefit plans actuarial gains /losses.
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Sum of pre tax adjustment to other comprehensive income for curtailments and settlements, net, related to defined benefit plans.
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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.
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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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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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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.
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Amount before tax, after reclassification adjustments, of prior service cost (credit) that has not been recognized in the income statement.
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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).
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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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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.
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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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Amount before tax, after reclassification adjustments of other comprehensive income (loss).
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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount before tax, after 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.
+ References
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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.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) allocated to other comprehensive income (loss).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.
+ References
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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.
+ References
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| - References
No definition available.
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