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Loans and ACL (Summary of Loans Collectively Evaluated for Impairment) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Recorded Investment, Collectively evaluated for impairment $ 118,197us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment $ 113,405us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Related ALLL, Collectively evaluated for impairment 1,264us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 1,365us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Commercial and Industrial [Member]    
Recorded Investment, Collectively evaluated for impairment 41,120us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialAndIndustrialMember		 38,042us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialAndIndustrialMember
Related ALLL, Collectively evaluated for impairment 379us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialAndIndustrialMember		 382us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialAndIndustrialMember
CRE Income Producing Properties [Member]    
Recorded Investment, Collectively evaluated for impairment 10,583us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreIncomeProducingPropertiesMember		 10,033us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreIncomeProducingPropertiesMember
Related ALLL, Collectively evaluated for impairment 147us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreIncomeProducingPropertiesMember		 128us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreIncomeProducingPropertiesMember
CRE Construction And Development [Member]    
Recorded Investment, Collectively evaluated for impairment 2,670us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreConstructionAndDevelopmentMember		 2,289us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreConstructionAndDevelopmentMember
Related ALLL, Collectively evaluated for impairment 39us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreConstructionAndDevelopmentMember		 60us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CreConstructionAndDevelopmentMember
Commercial Other Lending Subsidiaries [Member]    
Recorded Investment, Collectively evaluated for impairment 5,351us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialOtherLendingSubsidiariesMember		 4,501us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialOtherLendingSubsidiariesMember
Related ALLL, Collectively evaluated for impairment 20us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialOtherLendingSubsidiariesMember		 15us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_CommercialOtherLendingSubsidiariesMember
Direct Retail Lending [Member]    
Recorded Investment, Collectively evaluated for impairment 8,048us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_DirectRetailLendingMember		 15,648us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_DirectRetailLendingMember
Related ALLL, Collectively evaluated for impairment 86us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_DirectRetailLendingMember		 166us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_DirectRetailLendingMember
Retail Revolving Credit [Member]    
Recorded Investment, Collectively evaluated for impairment 2,419us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailRevolvingCreditMember		 2,355us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailRevolvingCreditMember
Related ALLL, Collectively evaluated for impairment 94us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailRevolvingCreditMember		 96us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailRevolvingCreditMember
Retail Residential Mortgage-Nonguaranteed [Member]    
Recorded Investment, Collectively evaluated for impairment 29,660us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageNonguaranteedMember		 22,557us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageNonguaranteedMember
Related ALLL, Collectively evaluated for impairment 181us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageNonguaranteedMember		 160us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageNonguaranteedMember
Retail Residential Mortgage-Government Guaranteed [Member]    
Recorded Investment, Collectively evaluated for impairment 622us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageGovernmentGuaranteedMember		 759us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageGovernmentGuaranteedMember
Related ALLL, Collectively evaluated for impairment 4us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageGovernmentGuaranteedMember		 7us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailResidentialMortgageGovernmentGuaranteedMember
Retail Sales Finance [Member]    
Recorded Investment, Collectively evaluated for impairment 10,579us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailSalesFinanceMember		 9,363us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailSalesFinanceMember
Related ALLL, Collectively evaluated for impairment 46us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailSalesFinanceMember		 41us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailSalesFinanceMember
Retail Other Lending Subsidiaries [Member]    
Recorded Investment, Collectively evaluated for impairment 5,930us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailOtherLendingSubsidiariesMember		 5,823us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailOtherLendingSubsidiariesMember
Related ALLL, Collectively evaluated for impairment 204us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailOtherLendingSubsidiariesMember		 196us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_RetailOtherLendingSubsidiariesMember
Acquired from FDIC [Member]    
Recorded Investment, Collectively evaluated for impairment 1,215us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_AcquiredFromFdicMember		 2,035us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_AcquiredFromFdicMember
Related ALLL, Collectively evaluated for impairment $ 64us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_AcquiredFromFdicMember		 $ 114us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bbt_AcquiredFromFdicMember