Quarterly report pursuant to Section 13 or 15(d)

Securities - OTTI Significant Assumptions (Details)

v2.4.1.9
Securities - OTTI Significant Assumptions (Details) (Non-agency residential)
Mar. 31, 2015
Weighted Average
  
Significant Assumptions:  
Annual prepayment speed 11.80%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresPrepaymentSpeed
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Loss severity 40.80%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Life default rate 36.30%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted Average | Prime
  
Significant Assumptions:  
Loss severity 37.70%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_InternalCreditAssessmentAxis
= bac_PrimeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Life default rate 22.90%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_InternalCreditAssessmentAxis
= bac_PrimeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted Average | Alt-A Loan
  
Significant Assumptions:  
Loss severity 39.20%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_InternalCreditAssessmentAxis
= bac_AltALoanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Life default rate 38.50%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_InternalCreditAssessmentAxis
= bac_AltALoanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted Average | Subprime
  
Significant Assumptions:  
Loss severity 52.40%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_InternalCreditAssessmentAxis
= bac_SubprimeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Life default rate 39.60%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_InternalCreditAssessmentAxis
= bac_SubprimeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Minimum
  
Significant Assumptions:  
Annual prepayment speed 3.50%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresPrepaymentSpeed
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Loss severity 13.80%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Life default rate 1.50%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum
  
Significant Assumptions:  
Annual prepayment speed 23.70%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresPrepaymentSpeed
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Loss severity 51.20%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLossSeverity
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Life default rate 97.60%bac_OtherthanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedinEarningsNetQualitativeDisclosuresLifeDefaultRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember