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Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 29, 2015
Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets $ 7,640us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill $ 7,660us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets, Gross Carrying Amount 73,219us-gaap_FiniteLivedIntangibleAssetsGross 73,887us-gaap_FiniteLivedIntangibleAssetsGross
Finite-lived Intangible Assets, Accumulated Amortization (46,525)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [1] (46,381)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [1]
Finite-lived Intangible Assets, less Accumulated Amortization 26,694us-gaap_FiniteLivedIntangibleAssetsNet 27,506us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets, gross carrying amount 80,859us-gaap_IntangibleAssetsGrossExcludingGoodwill [1] 81,547us-gaap_IntangibleAssetsGrossExcludingGoodwill [1]
Identifiable Intangible Assets, less Accumulated Amortization 34,334us-gaap_IntangibleAssetsNetExcludingGoodwill [1],[2] 35,166us-gaap_IntangibleAssetsNetExcludingGoodwill [1],[2]
Developed Technology Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets, Gross Carrying Amount 70,251us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 70,946us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite-lived Intangible Assets, Accumulated Amortization (44,759)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 (44,694)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite-lived Intangible Assets, less Accumulated Amortization 25,493us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 26,252us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets, Gross Carrying Amount 1,910us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 1,951us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Finite-lived Intangible Assets, Accumulated Amortization (869)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 (855)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Finite-lived Intangible Assets, less Accumulated Amortization 1,041us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 1,096us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
License Agreements and Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets, Gross Carrying Amount 1,057us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember		 991us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember
Finite-lived Intangible Assets, Accumulated Amortization (897)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember		 (832)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember
Finite-lived Intangible Assets, less Accumulated Amortization 160us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember		 159us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pfe_LicensingAgreementsAndOtherMember
Trade Names [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets 7,206us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 7,273us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
In Process Research and Development [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets $ 434us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 $ 387us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
[1] The decrease in identifiable intangible assets, less accumulated amortization, is primarily related to amortization, partially offset by assets acquired as part of the acquisition of Baxter's portfolio of marketed vaccines. For information about the assets acquired as part of the acquisition of Baxter's portfolio of marketed vaccines, see Note 2A.
[2] Amounts may not add due to rounding.