| **Subsequent Events (Details) (USD $)Share data in Millions, except Per Share data, unless otherwise specified** | 12 Months Ended                                                                                                                             | 0 Months Ended                                                                                                                           | 1 Months Ended                                                                                                                           | 0 Months Ended                                                                                                                                                                                                                    | 6 Months Ended                                                                                                                                                                                                                                                          |                                                                                                                                     |                                                                                                                                                                                         |                                                                 |                                                                 |                                                                 |
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| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Accelerated share repurchases, authorized amount                                                                 |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    | $ 11,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 10,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 10,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 10,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 |   |
| Shares repurchased                                                                                               | 165us-gaap_TreasuryStockSharesAcquired                                                                                                      | 563us-gaap_TreasuryStockSharesAcquired                                                                                                   | 349us-gaap_TreasuryStockSharesAcquired                                                                                                   |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Collaborative Arrangement [Member]                                                                               |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Upfront payments and milestone payments                                                                          | 1,189,000,000pfe_CollaborativeArrangementUpfrontAndMilestonePayments/ us-gaap_TypeOfArrangementAxis= us-gaap_CollaborativeArrangementMember | 67,000,000pfe_CollaborativeArrangementUpfrontAndMilestonePayments/ us-gaap_TypeOfArrangementAxis= us-gaap_CollaborativeArrangementMember | 44,000,000pfe_CollaborativeArrangementUpfrontAndMilestonePayments/ us-gaap_TypeOfArrangementAxis= us-gaap_CollaborativeArrangementMember |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Subsequent Event [Member] | February 9, 2015 Through June 28, 2015 [Member]                                      |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Accelerated share repurchases, authorized amount                                                                 |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   | 5,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1/ us-gaap_AcceleratedShareRepurchasesDateAxis= pfe_February92015ThroughJune282015Member/ us-gaap_SubsequentEventTypeAxis= us-gaap_SubsequentEventMember |
| Shares repurchased                                                                                               |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     | 150us-gaap_TreasuryStockSharesAcquired/ us-gaap_AcceleratedShareRepurchasesDateAxis= pfe_February92015ThroughJune282015Member/ us-gaap_SubsequentEventTypeAxis= us-gaap_SubsequentEventMember                                     |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Accelerated share repurchases, cash paid                                                                         |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     | 5,000,000,000us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt/ us-gaap_AcceleratedShareRepurchasesDateAxis= pfe_February92015ThroughJune282015Member/ us-gaap_SubsequentEventTypeAxis= us-gaap_SubsequentEventMember |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Subsequent Event [Member] | Collaborative Arrangement [Member] | OPKO Health, Inc. [Member]                      |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Upfront payments and milestone payments                                                                          |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              | 295,000,000pfe_CollaborativeArrangementUpfrontAndMilestonePayments/ us-gaap_CounterpartyNameAxis= pfe_OPKOHealthInc.Member/ us-gaap_SubsequentEventTypeAxis= us-gaap_SubsequentEventMember/ us-gaap_TypeOfArrangementAxis= us-gaap_CollaborativeArrangementMember       |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Potential milestone payments                                                                                     |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              | 275,000,000pfe_CollaborativeArrangementContingentPaymentsMaximumExposure/ us-gaap_CounterpartyNameAxis= pfe_OPKOHealthInc.Member/ us-gaap_SubsequentEventTypeAxis= us-gaap_SubsequentEventMember/ us-gaap_TypeOfArrangementAxis= us-gaap_CollaborativeArrangementMember |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Baxter International Inc. [Member]                                                                               |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Total consideration transferred                                                                                  |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    | 635,000,000us-gaap_BusinessCombinationConsiderationTransferred1/ us-gaap_BusinessAcquisitionAxis= pfe_BaxterInternationalInc.Member |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Forecast [Member] | Hospira [Member]                                                                             |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| **Subsequent Event [Line Items]**                                                                                |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                |                                                                                                                                                                                    |                                                            |                                                            |                                                            |   |   |
| Business acquisition, per share in cash                                                                          |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                | $ 90us-gaap_BusinessAcquisitionSharePrice/ us-gaap_BusinessAcquisitionAxis= pfe_HospiraMember/ us-gaap_StatementScenarioAxis= us-gaap_ScenarioForecastMember                            |                                                            |                                                            |                                                            |   |   |
| Percentage of transaction financed, cash                                                                         |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                | 66.67%pfe_BusinessCombinationPercentageofTransactionFinancedCash/ us-gaap_BusinessAcquisitionAxis= pfe_HospiraMember/ us-gaap_StatementScenarioAxis= us-gaap_ScenarioForecastMember     |                                                            |                                                            |                                                            |   |   |
| Percentage of transaction financed, debt                                                                         |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                | 33.34%pfe_BusinessCombinationPercentageofTransactionFinancedDebt/ us-gaap_BusinessAcquisitionAxis= pfe_HospiraMember/ us-gaap_StatementScenarioAxis= us-gaap_ScenarioForecastMember     |                                                            |                                                            |                                                            |   |   |
| Total consideration transferred                                                                                  |                                                                                                                                        |                                                                                                                                     |                                                                                                                                     |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                    |                                                                                                                                | $ 17,000,000,000us-gaap_BusinessCombinationConsiderationTransferred1/ us-gaap_BusinessAcquisitionAxis= pfe_HospiraMember/ us-gaap_StatementScenarioAxis= us-gaap_ScenarioForecastMember |                                                            |                                                            |                                                            |   |   |

| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Percentage of Transaction Financed, Cash
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Percentage of Transaction Financed, Debt
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Collaborative Arrangement, Contingent Payments, Maximum Exposure
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow to our partners for payments made upfront as part of a collaborative arrangement and the payments upon the achievement of milestones.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653
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| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.
+ References
No definition available.
+ Details**Name:**us-gaap_BusinessAcquisitionSharePrice**Namespace Prefix:**us-gaap_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
+ References
No definition available.
+ Details**Name:**us-gaap_StockRepurchaseProgramAuthorizedAmount1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                            |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| X                                                                                                                                                         |
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| X                                                                                                                                                    |
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