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Contingencies and Certain Commitments - Product Litigation, Commercial and Other Matters, Legal Proceedings (Details) | 12 Months Ended
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Dec. 31, 2018 manufacturer
Pfizer And Hospira And Various Other Manufacturers Versus Mississippi Attorney General [Member] | Docetaxel [Member] | Pending Litigation [Member] |
Loss Contingencies [Line Items] |
Number of defendants other than main defendant | 8

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- Definition Loss Contingency, Number Of Defendants Other Than Main Defendant + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_LitigationCaseAxis=pfe_PfizerAndHospiraAndVariousOtherManufacturersVersusMississippiAttorneyGeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=pfe_DocetaxelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |