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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis - Footnotes (Detail) - Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Footnotes to selected financial assets and liabilities: |  |
Short-term equity securities held in trust | $ 12 | $ 19
Long-term equity securities held in trust | $ 35 | $ 42

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- Definition Equity Securities, FV-NI, Restricted, Current + References No definition available. + Details
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Namespace Prefix: | pfe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Equity Securities, FV-NI, Restricted, Noncurrent + References No definition available. + Details
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Namespace Prefix: | pfe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Footnotes to selected financial assets and liabilities [Abstract] + References No definition available. + Details
Name: | pfe_FootnotesToSelectedFinancialAssetsAndLiabilitiesAbstract
Namespace Prefix: | pfe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |