2.4.0.8404090 - Disclosure - Securities Available for Sale, Residential Mortgage-Backed Securities, Credit Loss Component (Details)truefalseIn Millions, unless otherwise specifiedfalse1falseUSDfalsefalse$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$2falseUSDfalsefalse$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$3falseUSDfalsefalse$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$4falseUSDfalsefalse$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$5falseUSDtruefalse$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$6falseUSDtruefalse$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$7falseUSDtruefalse$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$8falseUSDtruefalse$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$9falseUSDtruefalse$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$10falseUSDtruefalse$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$11falseUSDtruefalse$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$12falseUSDtruefalse$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$1true5wfc_CreditImpairmentLossesOnResidentialMortgageBackedSecuritiesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse02false6us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecuritiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse7600000076USD$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.
false23true5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementNonagencyNonInvestmentGradeMortgageBackedSecuritiesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse04false6wfc_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.false05false6wfc_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.false06true5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementExpectedRemainingLifeOfLoanLossesAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse07false6wfc_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.false08false6wfc_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.false09false6wfc_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.false010false6wfc_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.false011false5wfc_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.false012true5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementCurrentSubordinationLevelsAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse013false6wfc_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.false014false6wfc_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.false015false6wfc_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.false016true5wfc_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentSpeedAbstractwfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse017false6wfc_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.false018false6wfc_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.false019false6wfc_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