Earnings/ (Loss) Per Share - Additional Information (Detail) In Millions	Jun. 30, 2011	Jun. 30, 2010
Equivalent shares related to common stock options and common stock warrants outstanding were excluded from the computations of diluted income/(loss) per average common share because they would have been antidilutive	32	32

Name:

sti_AntidilutiveSecuritiesExcludedFromEarningsPerShareComputationAmount

Namespace Prefix:

sti

Data Type:

xbrli:sharesItemType

Balance Type:

na

Period Type:

instant