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Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Other Liabilities, Fair Value Disclosure $ 27us-gaap_OtherLiabilitiesFairValueDisclosure [1] $ 29us-gaap_OtherLiabilitiesFairValueDisclosure [2],[3]
Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Other Liabilities, Fair Value Disclosure   $ 3us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= sti_VisaInterestMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1] Includes contingent consideration obligations related to acquisitions.
[2] Includes $336 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $103 million in mutual fund investments, and $1 million of other.
[3] Includes contingent consideration obligations related to acquisitions, as well as the derivative associated with the Company's sale of Visa shares during the year ended December 31, 2009.