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Loan Servicing (Residential MSRs Sensitivity) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Yr
Dec. 31, 2014
Yr
Residential Mortgage Servicing Rights [Member]    
Weighted average prepayment speed 14.00%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 12.00%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Effect on fair value of a 10% increase in weighted average prepayment speed $ (30)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 $ (30)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Effect on fair value of a 20% increase in weighted average prepayment speed (58)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 (58)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
OAS 9.10%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 9.30%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Effect on fair value of a 10% increase in weighted average OAS (22)bbt_SensitivityAnalysisOfFairValueOf10IncreaseInWeightedAverageOas
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 (26)bbt_SensitivityAnalysisOfFairValueOf10IncreaseInWeightedAverageOas
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Effect on fair value of a 20% increase in weighted average OAS $ (42)bbt_SensitivityAnalysisOfFairValueOf20PercentIncreaseInWeightedAverageOas
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 $ (50)bbt_SensitivityAnalysisOfFairValueOf20PercentIncreaseInWeightedAverageOas
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Composition of residential mortgage loans serviced for others 100.00%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 100.00%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Weighted average life, in years 5.1bbt_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesWeightedAverageLife2
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember		 5.7bbt_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesWeightedAverageLife2
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
Residential Mortgage Servicing Rights [Member] | Maximum [Member]    
Weighted average prepayment speed 14.90%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MaximumMember		 12.80%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MaximumMember
OAS 9.70%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MaximumMember		 9.90%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MaximumMember
Residential Mortgage Servicing Rights [Member] | Minimum [Member]    
Weighted average prepayment speed 12.50%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MinimumMember		 10.80%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MinimumMember
OAS 8.90%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MinimumMember		 9.10%bbt_OptionAdjustedSpread
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= bbt_ResidentialMortgageServicingRightsMember
/ bbt_ServicingRangeAxis
= us-gaap_MinimumMember
Fixed-Rate Residential Mortgage [Member]    
Composition of residential mortgage loans serviced for others 99.40%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember		 99.40%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
Adjustable Rate Residential Mortgage [Member]    
Composition of residential mortgage loans serviced for others 0.60%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 0.60%bbt_PercentageOfMortgageLoansServicedForOthers
/ us-gaap_ServicingLiabilitiesAtFairValueByTypeOfFinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember