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Tax Matters - Reconciliation of Gross Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Balance, beginning $ (6,087)us-gaap_UnrecognizedTaxBenefits [1] $ (6,315)us-gaap_UnrecognizedTaxBenefits [1] $ (7,309)us-gaap_UnrecognizedTaxBenefits
Divestitures(a) 0pfe_UnrecognizedTaxBenefitsResultingFromDisposalGroup [2] 29pfe_UnrecognizedTaxBenefitsResultingFromDisposalGroup [2] 85pfe_UnrecognizedTaxBenefitsResultingFromDisposalGroup [2]
Increases based on tax positions taken during a prior period(b) (110)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions [3] (205)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions [3] (139)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions [3]
Decreases based on tax positions taken during a prior period(b), (c) 473us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions [3],[4] 876us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions [3],[4] 1,442us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions [3],[4]
Decreases based on settlements for a prior period(d) 70us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities [5] 571us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities [5] 647us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities [5]
Increases based on tax positions taken during the current period(b) (795)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions [3] (1,178)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions [3] (1,125)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions [3]
Impact of foreign exchange 161pfe_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation 38pfe_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation 78pfe_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation
Other, net(b), (e) 106pfe_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseOther [3],[6] 97pfe_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseOther [3],[6] 6pfe_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseOther [3],[6]
Balance, ending(f) $ (6,182)us-gaap_UnrecognizedTaxBenefits [1] $ (6,087)us-gaap_UnrecognizedTaxBenefits [1] $ (6,315)us-gaap_UnrecognizedTaxBenefits [1]
[1] In 2014, included in Income taxes payable ($13 million), Current deferred tax assets and other current tax assets ($59 million), Noncurrent deferred tax assets and other noncurrent tax assets ($165 million), Current deferred tax liabilities ($13 million), Noncurrent deferred tax liabilities ($2.4 billion) and Other taxes payable ($3.5 billion). In 2013, included in Income taxes payable ($51 million), Current deferred tax assets and other current tax assets ($63 million), Noncurrent deferred tax assets and other noncurrent tax assets ($241 million), Noncurrent deferred tax liabilities ($2.3 billion) and Other taxes payable ($3.4 billion).
[2] Primarily relates to the sales of our Nutrition and Animal Health (Zoetis) businesses. See also Note 2D.
[3] Primarily included in Provision for taxes on income.
[4] Primarily related to effectively settling certain tax positions with the U.S. and foreign tax authorities. See also Note 5A.
[5] Primarily related to cash payments.
[6] Includes decreases as a result of a lapse of applicable statutes of limitations.