2.4.0.8404090 - Disclosure - Securities Available for Sale, Residential Mortgage-Backed Securities, Credit Loss Component (Details)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$FROM_Apr01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000072971duration2013-04-01T00:00:002013-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$FROM_Apr01_2012_TO_Jun30_2012http://www.sec.gov/CIK0000072971duration2012-04-01T00:00:002012-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$FROM_Jan01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000072971duration2013-01-01T00:00:002013-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$FROM_Jan01_2012_TO_Jun30_2012http://www.sec.gov/CIK0000072971duration2012-01-01T00:00:002012-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDtruefalse$FROM_Apr01_2013_TO_Jun30_2013_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000072971duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6false USDtruefalse$FROM_Apr01_2012_TO_Jun30_2012_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000072971duration2012-04-01T00:00:002012-06-30T00:00:00falsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7false USDtruefalse$FROM_Jan01_2013_TO_Jun30_2013_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000072971duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8false USDtruefalse$FROM_Jan01_2012_TO_Jun30_2012_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000072971duration2012-01-01T00:00:002012-06-30T00:00:00falsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9false USDtruefalse$FROM_Apr01_2013_TO_Jun30_2013_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMember_us-gaap_PaymentAndPerformanceRiskCreditRatingAxis_ExternalCreditRatingNonInvestmentGradeMemberhttp://www.sec.gov/CIK0000072971duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseNon-investment Grade [Member]us-gaap_PaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ExternalCreditRatingNonInvestmentGradeMemberus-gaap_PaymentAndPerformanceRiskCreditRatingAxisexplicitMemberfalsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10false USDtruefalse$FROM_Jan01_2012_TO_Mar31_2012_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMember_us-gaap_PaymentAndPerformanceRiskCreditRatingAxis_ExternalCreditRatingNonInvestmentGradeMemberhttp://www.sec.gov/CIK0000072971duration2012-01-01T00:00:002012-03-31T00:00:00falsefalseNon-investment Grade [Member]us-gaap_PaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ExternalCreditRatingNonInvestmentGradeMemberus-gaap_PaymentAndPerformanceRiskCreditRatingAxisexplicitMemberfalsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11false USDtruefalse$FROM_Jan01_2013_TO_Jun30_2013_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMember_us-gaap_PaymentAndPerformanceRiskCreditRatingAxis_ExternalCreditRatingNonInvestmentGradeMemberhttp://www.sec.gov/CIK0000072971duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseNon-investment Grade [Member]us-gaap_PaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ExternalCreditRatingNonInvestmentGradeMemberus-gaap_PaymentAndPerformanceRiskCreditRatingAxisexplicitMemberfalsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12false USDtruefalse$FROM_Jan01_2012_TO_Jun30_2012_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_ResidentialMortgageBackedSecuritiesMember_us-gaap_PaymentAndPerformanceRiskCreditRatingAxis_ExternalCreditRatingNonInvestmentGradeMemberhttp://www.sec.gov/CIK0000072971duration2012-01-01T00:00:002012-06-30T00:00:00falsefalseNon-investment Grade [Member]us-gaap_PaymentAndPerformanceRiskCreditRatingAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ExternalCreditRatingNonInvestmentGradeMemberus-gaap_PaymentAndPerformanceRiskCreditRatingAxisexplicitMemberfalsefalseResidential [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 5wfc_CreditImpairmentLossesOnResidentialMortgageBackedSecuritiesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse02false 6us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecuritiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse7600000076USD$falsetruefalse2truefalsefalse8200000082USD$falsetruefalse3truefalsefalse114000000114USD$falsetruefalse4truefalsefalse133000000133USD$falsetruefalse5truefalsefalse2200000022USD$falsetruefalse6truefalsefalse3400000034USD$falsetruefalse7truefalsefalse3700000037USD$falsetruefalse8truefalsefalse4800000048USD$falsetruefalse9truefalsefalse2200000022USD$falsetruefalse10truefalsefalse3400000034USD$falsetruefalse11truefalsefalse3700000037USD$falsetruefalse12truefalsefalse4800000048USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false23true 5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementNonagencyNonInvestmentGradeMortgageBackedSecuritiesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse04false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesMinimumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.010.01falsefalsefalse2truetruefalse0.010.01falsefalsefalse3truetruefalse0.010.01falsefalsefalse4truetruefalse0.010.01falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held Assumption For Measurement Expected Remaining Life Of Loan Losses Minimum.No definition available.false05false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesMaximumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.200.20falsefalsefalse2truetruefalse0.370.37falsefalsefalse3truetruefalse0.200.20falsefalsefalse4truetruefalse0.440.44falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held Assumption For Measurement Expected Remaining Life Of Loan Losses Maximum.No definition available.false06true 5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse07false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesImpairmentDistributionRangeOnewfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.980.98falsefalsefalse2truetruefalse0.680.68falsefalsefalse3truetruefalse0.960.96falsefalsefalse4truetruefalse0.620.62falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Expected Remaining Life of Loan Losses, Impairment Distribution Range OneNo definition available.false08false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesImpairmentDistributionRangeTwowfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.010.01falsefalsefalse2truetruefalse0.180.18falsefalsefalse3truetruefalse0.030.03falsefalsefalse4truetruefalse0.160.16falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Expected Remaining Life of Loan Losses, Impairment Distribution Range TwoNo definition available.false09false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesImpairmentDistributionRangeThreewfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.010.01falsefalsefalse2truetruefalse0.110.11falsefalsefalse3truetruefalse0.010.01falsefalsefalse4truetruefalse0.080.08falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Expected Remaining Life of Loan Losses, Impairment Distribution Range ThreeNo definition available.false010false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesImpairmentDistributionRangeFourwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.000.00falsefalsefalse2truetruefalse0.030.03falsefalsefalse3truetruefalse0.000.00falsefalsefalse4truetruefalse0.140.14falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Expected Remaining Life of Loan Losses, Impairment Distribution Range FourNo definition available.false011false 5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesImpairmentDistributionWeightedAveragewfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.060.06falsefalsefalse2truetruefalse0.090.09falsefalsefalse3truetruefalse0.060.06falsefalsefalse4truetruefalse0.090.09falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Expected Remaining Life of Loan Losses, Impairment Distribution Weighted AverageNo definition available.false012true 5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementCurrentSubordinationLevelsAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse013false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementCurrentSubordinationLevelsMinimumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse00falsefalsefalse2truetruefalse00falsefalsefalse3truetruefalse00falsefalsefalse4truetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment, Credit Losses Recognized In Earnings, Credit Losses On Debt Securities Held Assumption For Measurement Current Subordination Levels, MinimumNo definition available.false014false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementCurrentSubordinationLevelsMaximumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.050.05falsefalsefalse2truetruefalse0.220.22falsefalsefalse3truetruefalse0.410.41falsefalsefalse4truetruefalse0.570.57falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment, Credit Losses Recognized In Earnings, Credit Losses On Debt Securities Held Assumption For Measurement Current Subordination Levels, Maximum.No definition available.false015false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementCurrentSubordinationLevelsWeightedAveragewfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.010.01falsefalsefalse2truetruefalse0.030.03falsefalsefalse3truetruefalse0.000.00falsefalsefalse4truetruefalse0.020.02falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Current Subordination Levels, Weighted AverageNo definition available.false016true 5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentSpeedAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse017false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentSpeedMinimumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.060.06falsefalsefalse2truetruefalse0.050.05falsefalsefalse3truetruefalse0.040.04falsefalsefalse4truetruefalse0.050.05falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held Assumption For Measurement Prepayment Speed Minimum.No definition available.false018false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentSpeedMaximumwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.200.20falsefalsefalse2truetruefalse0.240.24falsefalsefalse3truetruefalse0.200.20falsefalsefalse4truetruefalse0.290.29falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held Assumption For Measurement Prepayment Speed Maximum.No definition available.false019false 6wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentSpeedWeightedAveragewfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.160.16falsefalsefalse2truetruefalse0.140.14falsefalsefalse3truetruefalse0.150.15falsefalsefalse4truetruefalse0.140.14falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalsenum:percentItemTypepureOther than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Assumption for Measurement, Prepayment Speed, weighted AverageNo definition available.false0falseSecurities Available for Sale, Residential Mortgage-Backed Securities, Credit Loss Component (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://wellsfargo.com/role/SecuritiesAvailableForSaleResidentialMortgageBackedSecuritiesCreditLossComponentDetails1219