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Financial Instruments - Long-Term Debt Narrative (Details) $ in Millions | Mar. 29, 2020 USD ($)
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Unsecured Debt [Member] | Senior Notes Due 2047 [Member] |
Debt Instrument [Line Items] |
Repurchase amount | $ 1,065

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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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=pfe_SeniorNotesDue2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |