Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Credit Derivatives [Line Items]
Cash collateral received from dealer counterparties		$ 53
Cash collateral posted		82
Dealer Counterparties
Credit Derivatives [Line Items]
Cash collateral received from dealer counterparties	$ 103	56
Derivatives in a net gain position secured by collateral received	102	55
Unsecured positions in a net gain with dealer counterparties after collateral postings	1	2
Cash collateral posted	62	75
Derivatives in a net loss position	60	76
Additional collateral that would have been posted had BB&T's credit ratings dropped below investment grade	0	1
Central Clearing Parties
Credit Derivatives [Line Items]
Cash collateral posted	21	17
Derivatives in a net loss position	24	8
Securities pledged to central clearing parties	$ 138	$ 124