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Other (Income)/Deductions - Net - Additional Information about Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Total intangible assets, fair value disclosure $ 526pfe_IntangibleAssetsNetExcludingGoodwillFairValueDisclosure [1]    
Intangible asset impairments 396us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 803us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 835us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Developed Technology Rights [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Finite-lived intangible assets, fair value disclosure 233us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1],[2]    
Impairment of intangible assets, finite-lived 159us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [2] 394us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 242us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
In Process Research and Development [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1],[2]    
Impairment of intangible assets, indefinite-lived 190us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [2] 227us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		  
Intangible asset impairments     393us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Brands [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 293us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [1],[2]    
Impairment of intangible assets, indefinite-lived 47us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [2]    
Fair value inputs Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Total intangible assets, fair value disclosure 0pfe_IntangibleAssetsNetExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]    
Fair value inputs Level 1 [Member] | Developed Technology Rights [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Finite-lived intangible assets, fair value disclosure 0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1],[2]    
Fair value inputs Level 1 [Member] | In Process Research and Development [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1],[2]    
Fair value inputs Level 1 [Member] | Brands [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [1],[2]    
Fair value inputs Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Total intangible assets, fair value disclosure 0pfe_IntangibleAssetsNetExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]    
Fair value inputs Level 2 [Member] | Developed Technology Rights [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Finite-lived intangible assets, fair value disclosure 0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1],[2]    
Fair value inputs Level 2 [Member] | In Process Research and Development [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1],[2]    
Fair value inputs Level 2 [Member] | Brands [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [1],[2]    
Fair value inputs Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Total intangible assets, fair value disclosure 526pfe_IntangibleAssetsNetExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]    
Fair value inputs Level 3 [Member] | Developed Technology Rights [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Finite-lived intangible assets, fair value disclosure 233us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1],[2]    
Fair value inputs Level 3 [Member] | In Process Research and Development [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1],[2]    
Fair value inputs Level 3 [Member] | Brands [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Indefinite-lived intangible assets, fair value disclosure $ 293us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [1],[2]    
[1] The fair value amount is presented as of the date of impairment, as these assets are not measured at fair value on a recurring basis. See also Note 1E.
[2] Reflects intangible assets written down to fair value in 2014. Fair value was determined using the income approach, specifically the multi-period excess earnings method, also known as the discounted cash flow method. We started with a forecast of all the expected net cash flows associated with the asset and then we applied an asset-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows, which includes the expected impact of competitive, legal and/or regulatory forces on the product and the impact of technological risk associated with IPR&D assets; the discount rate, which seeks to reflect the various risks inherent in the projected cash flows; and the tax rate, which seeks to incorporate the geographic diversity of the projected cash flows.