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Commitments and Contingencies (Impact of Adoption of Affordable Housing Guidance) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies      
Increase in other income $ 34bbt_IncreaseInOtherIncome    
Increase in provision for income taxes (39)bbt_IncreaseInProvisionForIncomeTaxes    
Increase (decrease) in net income and net income available to common shareholders (5)bbt_ChangeInNetIncome    
Decrease in diluted EPS $ (0.01)bbt_ChangeInDilutedEps    
Decrease in retained earnings   $ (49)bbt_ImpactToRetainedEarnings $ (29)bbt_ImpactToRetainedEarnings