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Loans - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans transferred from loans to loans held for sale $ 3,280,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 $ 280,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 $ 3,695,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1  
Transfer of Loans Held-for-sale to Portfolio Loans 44,000,000us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1 43,000,000us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1 71,000,000us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1  
Loans held for investment sold 4,000,000,000sti_LoansHeldForInvestmentSold 807,000,000sti_LoansHeldForInvestmentSold    
Gain (Loss) on Sales of Loans, Net 83,000,000us-gaap_GainLossOnSalesOfLoansNet 1,000,000us-gaap_GainLossOnSalesOfLoansNet    
Long-term Debt 13,022,000,000us-gaap_LongTermDebt [1] 10,700,000,000us-gaap_LongTermDebt [1]    
Other Short-term Borrowings 5,634,000,000us-gaap_OtherShortTermBorrowings 5,788,000,000us-gaap_OtherShortTermBorrowings    
Letters of Credit Outstanding, Amount 7,900,000,000us-gaap_LettersOfCreditOutstandingAmount 853,000,000us-gaap_LettersOfCreditOutstandingAmount    
Loans and Leases Receivable, Impaired, Commitment to Lend 1,000,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend 8,000,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend    
Loans held for investment 133,112,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [2] 127,877,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [2]    
Accrual Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,500,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		 2,700,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		    
Accruing TDRs current 96.00%sti_PercentageOfAccruingTroubledDebtRestructuringsCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		 96.00%sti_PercentageOfAccruingTroubledDebtRestructuringsCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment 73,392,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 64,310,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		    
Federally Guaranteed Student Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of Loan Portfolio Current 79.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		 81.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		    
Loans held for investment 4,827,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		 5,545,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		    
Residential Guaranteed [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment sold       2,000,000,000sti_LoansHeldForInvestmentSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember
Percentage of Loan Portfolio Current 28.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		 82.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		    
Loans held for investment 632,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		 3,416,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		    
Residential Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment 38,775,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 43,190,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		    
Home Equity Line of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment 14,264,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [3] 14,809,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [3]    
Minimum [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans And Leases Receivable Individually Evaluated For Impairment 3,000,000sti_LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Cross-Border Outstanding Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross, Foreign 1,300,000,000us-gaap_LoansAndLeasesReceivableForeign
/ us-gaap_ConcentrationRiskByTypeAxis
= sti_CrossBorderOutstandingLoansMember		 956,000,000us-gaap_LoansAndLeasesReceivableForeign
/ us-gaap_ConcentrationRiskByTypeAxis
= sti_CrossBorderOutstandingLoansMember		    
Credit Concentration Risk [Member] | Residential Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment 38,800,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 43,200,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		    
Residential Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan subcategory as a percent of total loans 29.00%sti_Loansubcategoryasapercentoftotalloans
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		 34.00%sti_Loansubcategoryasapercentoftotalloans
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		    
Government guaranteed percent 2.00%sti_GovernmentGuaranteePercent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		 8.00%sti_GovernmentGuaranteePercent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		    
Home Equity Line of Credit [Member] | Credit Concentration Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unused Commitments to Extend Credit 10,900,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_OtherCommitmentsAxis
= us-gaap_HomeEquityMember		 11,200,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_OtherCommitmentsAxis
= us-gaap_HomeEquityMember		    
Mortgage Loans on Real Estate [Member] | Credit Concentration Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unused Commitments to Extend Credit 3,300,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_OtherCommitmentsAxis
= us-gaap_MortgageLoansOnRealEstateMember		 2,700,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_OtherCommitmentsAxis
= us-gaap_MortgageLoansOnRealEstateMember		    
Federal Home Loan Bank Advances [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Other Short-term Borrowings 4,000,000,000us-gaap_OtherShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 4,000,000,000us-gaap_OtherShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		    
Federal Home Loan Bank Advances [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Long-term Debt 4,000,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 3,000,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		    
Federal Reserve Bank Advances [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Pledged as Collateral 26,500,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		 27,100,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		    
Line of Credit Facility, Remaining Borrowing Capacity 18,400,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		 20,800,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		    
Federal Home Loan Bank Advances [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Pledged as Collateral 31,200,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 31,200,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		    
Line of Credit Facility, Remaining Borrowing Capacity $ 24,300,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 $ 20,100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		    
[1] Includes restricted shares of 2,930 thousand and 3,984 thousand at December 31, 2014 and December 31, 2013, respectively.
[2] Includes noncontrolling interest of $108 million and $119 million at December 31, 2014 and December 31, 2013, respectively.
[3] Excludes $632 million and $3.4 billion of guaranteed residential loans at December 31, 2014 and 2013, respectively.