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Borrowings and Contractual Commitments Long-term debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Percent of Subsidiary Debt held by Bank 90.00%sti_PercentofSubsidiaryDebtheldbyBank 85.00%sti_PercentofSubsidiaryDebtheldbyBank
Long-term Debt 13,022us-gaap_LongTermDebt [1] $ 10,700us-gaap_LongTermDebt [1]
debt denominated in foreign currency [Member]    
Debt Instrument [Line Items]    
Long-term Debt 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sti_DebtdenominatedinforeigncurrencyMember		  
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 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
Intercompany Debt, Amount 0sti_IntercompanyDebtAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 160sti_IntercompanyDebtAmount
/ 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		  
Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 3,630us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 3,001us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term Debt, Percentage Bearing Variable Interest, Amount 358us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 283us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Parent Company [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Jul. 29, 2014  
Debt Instrument, Maturity Date Range, End Jan. 15, 2028  
Parent Company [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 200us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 200us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
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] | Variable Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start May 29, 2015  
Debt Instrument, Maturity Date Range, End Aug. 01, 2019  
Parent Company [Member] | Variable Rate Debt [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Apr. 01, 2027  
Debt Instrument, Maturity Date Range, End Mar. 15, 2028  
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 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
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		  
Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 5,682us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 1,006us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term Debt, Percentage Bearing Variable Interest, Amount 742us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 3,783us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Jan. 02, 2014  
Debt Instrument, Maturity Date Range, End Dec. 29, 2053  
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Sep. 01, 2015  
Debt Instrument, Maturity Date Range, End Apr. 01, 2020  
Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Amount 500us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 500us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Debt Instrument, Fair Value Disclosure 1,283us-gaap_DebtInstrumentFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 1,300us-gaap_DebtInstrumentFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Subsidiaries [Member] | Variable Rate Debt [Member] | Senior Loans [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorLoansMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= sti_VariableRateDebtMember		 256us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorLoansMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= sti_VariableRateDebtMember
Subsidiaries [Member] | Variable Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Dec. 01, 2015  
Debt Instrument, Maturity Date Range, End Dec. 19, 2043  
Minimum [Member] | Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.38%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.35%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.89%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_JuniorSubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum [Member] | Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.35%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum [Member] | Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.52%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member] | Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.00%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.22%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_JuniorSubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum [Member] | Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 6.98%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 9.65%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Maximum [Member] | Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.54%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 7.25%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Tier one risk based capital [Member] | 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
/ 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.