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Fair Value Disclosures (Fair Value and Unpaid Principal Balance of LHFS) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
LHFS $ 1,423us-gaap_LoansReceivableHeldForSaleNet $ 1,222us-gaap_LoansReceivableHeldForSaleNet
Fair Value [Member]    
LHFS 1,423us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_FairValueMember		 1,222us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_FairValueMember
Aggregate UPB [Member]    
LHFS 1,390us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_AggregateUpbMember		 1,223us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_AggregateUpbMember
Fair Value Less Aggregate UPB [Member]    
LHFS $ 33us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_FairValueLessAggregateUpbMember		 $ (1)us-gaap_LoansReceivableHeldForSaleNet
/ bbt_FairValueLhfsAxis
= bbt_FairValueLessAggregateUpbMember