Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Dealer Counterparties
Credit Derivatives [Line Items]
Cash collateral received from dealer counterparties	$ 181	$ 283
Derivatives in a net gain position secured by that collateral	174	301
Unsecured positions in a net gain with dealer counterparties after collateral postings	0	18
Cash collateral, including initial margin, posted	242	156
Derivatives in a net loss position secured by that collateral	262	161
Additional collateral that would have been posted had BB&T's credit ratings dropped below investment grade	25	6
Central Clearing Parties
Credit Derivatives [Line Items]
Cash collateral, including initial margin, posted	265	223
Derivatives in a net loss position secured by that collateral	276	227
Securities pledged to central clearing parties	$ 142	$ 207