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Commitments and Contingencies (Impact of Adoption of Affordable Housing Guidance) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jan. 01, 2015
Commitments and Contingencies      
Increase in other income $ 141bbt_IncreaseInOtherIncome $ 160bbt_IncreaseInOtherIncome  
Increase in provision for income taxes (162)bbt_IncreaseInProvisionForIncomeTaxes (159)bbt_IncreaseInProvisionForIncomeTaxes  
Increase (decrease) in net income (21)bbt_ChangeInNetIncome 1bbt_ChangeInNetIncome  
Decrease in retained earnings     $ (49)bbt_ImpactToRetainedEarnings