Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Credit Derivatives [Line Items]
Cash collateral received from dealer counterparties	$ 50	$ 53
Cash collateral posted	64	82
Dealer Counterparties
Credit Derivatives [Line Items]
Cash collateral received from dealer counterparties	53	56
Derivatives in a net gain position secured by collateral received	52	55
Unsecured positions in a net gain with dealer counterparties after collateral postings	2	2
Cash collateral posted	56	75
Derivatives in a net loss position	59	76
Additional collateral that would have been posted had BB&T's credit ratings dropped below investment grade	3	1
Central Clearing Parties
Credit Derivatives [Line Items]
Cash collateral posted	14	17
Derivatives in a net loss position	22	8
Securities pledged to central clearing parties	$ 141	$ 124