Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Feb. 19, 2014	Jun. 28, 2013
Entity Registrant Name		SUNTRUST BANKS INC
Entity Central Index Key		0000750556
Current Fiscal Year End Date		--12-31
Entity Filer Category		Large Accelerated Filer
Document Type		10-K
Document Period End Date	Dec. 31, 2012	Dec. 31, 2013
Document Fiscal Year Focus		2013
Document Fiscal Period Focus		Q4
Amendment Flag		false
Entity Common Stock, Shares Outstanding			534,671,799
Entity Well-known Seasoned Issuer		Yes
Entity Voluntary Filers		No
Entity Current Reporting Status		Yes
Entity Public Float				$ 17.0