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Borrowings and Contractual Commitments Borrowings and Contractual Commitments - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt $ 13,022us-gaap_LongTermDebt [1] $ 10,700us-gaap_LongTermDebt [1]
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Long-term Debt 4,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
3,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Tier two risk based capital [Member]    
Debt Instrument [Line Items]    
Long-term Debt 792us-gaap_LongTermDebt
/ sti_RiskbasedcapitaltreatmentAxis
= sti_TiertworiskbasedcapitalMember
1,116us-gaap_LongTermDebt
/ sti_RiskbasedcapitaltreatmentAxis
= sti_TiertworiskbasedcapitalMember
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,791us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Two 72us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Three 4,332us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Four 514us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Five 30us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,468us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Long-term Debt 8,207us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6,589us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Subsidiaries [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Proceeds from Issuance of Senior Long-term Debt 1,040us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 28us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,054us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,232us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Four 774us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Five 891us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt, Maturities, Repayments of Principal after Year Five 836us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Long-term Debt 4,815us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,111us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Amount   627us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
Parent Company [Member] | Tier one risk based capital [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Amount   $ 627us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ sti_RiskbasedcapitaltreatmentAxis
= sti_TieroneriskbasedcapitalMember
[1] Includes restricted shares of 2,930 thousand and 3,984 thousand at December 31, 2014 and December 31, 2013, respectively.