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Loans - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other Real Estate $ 79,000,000us-gaap_OtherRealEstate [1]   $ 99,000,000us-gaap_OtherRealEstate [1]
Loans transferred from loans to loans held for sale 512,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 115,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1  
Transfer of Loans Held-for-sale to Portfolio Loans 11,000,000us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1 17,000,000us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1  
Loans held for investment sold 405,000,000sti_LoansHeldForInvestmentSold 85,000,000sti_LoansHeldForInvestmentSold  
Gain (Loss) on Sales of Loans, Net 6,000,000us-gaap_GainLossOnSalesOfLoansNet 9,000,000us-gaap_GainLossOnSalesOfLoansNet  
Long-term Debt 13,012,000,000us-gaap_LongTermDebt [2]   13,022,000,000us-gaap_LongTermDebt [2]
Other Short-term Borrowings 1,438,000,000us-gaap_OtherShortTermBorrowings   5,634,000,000us-gaap_OtherShortTermBorrowings
Letters of Credit Outstanding, Amount 6,400,000,000us-gaap_LettersOfCreditOutstandingAmount   7,900,000,000us-gaap_LettersOfCreditOutstandingAmount
Loans and Leases Receivable, Impaired, Commitment to Lend 5,000,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend   1,000,000us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Loans held for investment 132,380,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [3]   133,112,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount [3]
Financing Receivable Credit Quality Indicators [Table Text Block]
 
Commercial Loans
 
C&I
 
CRE
 
Commercial construction
(Dollars in millions)
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
Risk rating:
 
 
 
 
 
 
 
 
 
 
 
Pass

$64,295

 

$64,228

 

$6,265

 

$6,586

 

$1,468

 

$1,196

Criticized accruing
1,139

 
1,061

 
100

 
134

 
15

 
14

Criticized nonaccruing
140

 
151

 
24

 
21

 
1

 
1

Total

$65,574

 

$65,440

 

$6,389

 

$6,741

 

$1,484

 

$1,211


 
Residential Loans 1
 
Residential mortgages -
nonguaranteed
 
Home equity products
 
Residential construction
(Dollars in millions)
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
Current FICO score range:
 
 
 
 
 
 
 
 
 
 
 
700 and above

$18,752

 

$18,780

 

$11,245

 

$11,475

 

$327

 

$347

620 - 699
3,411

 
3,369

 
1,932

 
1,991

 
71

 
70

Below 620 2
1,256

 
1,294

 
777

 
798

 
19

 
19

Total

$23,419

 

$23,443

 

$13,954

 

$14,264

 

$417

 

$436


 
Consumer Loans 3
 
Other direct
 
Indirect
 
Credit cards
(Dollars in millions)
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
 
March 31,
2015
 
December 31, 2014
Current FICO score range:
 
 
 
 
 
 
 
 
 
 
 
700 and above

$4,345

 

$4,023

 

$7,324

 

$7,661

 

$613

 

$639

620 - 699
530

 
476

 
2,361

 
2,335

 
219

 
212

Below 620 2
62

 
74

 
651

 
648

 
46

 
50

Total

$4,937

 

$4,573

 

$10,336

 

$10,644

 

$878

 

$901


1 Excludes $655 million and $632 million of guaranteed residential loans at March 31, 2015 and December 31, 2014, respectively.
2 For substantially all loans with refreshed FICO scores below 620, the borrower’s FICO score at the time of origination exceeded 620 but has since deteriorated as the loan has seasoned.
3 Excludes $4.3 billion and $4.8 billion of guaranteed student loans at March 31, 2015 and December 31, 2014, respectively.
    
Accrual Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real estate properties for which formal foreclosure proceedings are in process 199,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		 [4]   208,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		 [4]
Financing Receivable, Modifications, Recorded Investment 2,600,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		   2,500,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember
Accruing TDRs current 96.71%sti_PercentageOfAccruingTroubledDebtRestructuringsCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember		   96.00%sti_PercentageOfAccruingTroubledDebtRestructuringsCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_AccrualLoansMember
Nonaccrual loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real estate properties for which formal foreclosure proceedings are in process 224,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_NonaccrualloansMember		 [4]   251,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_NonaccrualloansMember		 [4]
Proceeds due from FHA or VA [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real estate properties for which formal foreclosure proceedings are in process 177,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_ProceedsduefromFHAorVAMember		 [4]   182,000,000sti_Realestatepropertiesforwhichformalforeclosureproceedingsareinprocess
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_ProceedsduefromFHAorVAMember		 [4]
Other Real Estate 61,000,000us-gaap_OtherRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_ProceedsduefromFHAorVAMember		 [4]   57,000,000us-gaap_OtherRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sti_ProceedsduefromFHAorVAMember		 [4]
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other Real Estate 13,000,000us-gaap_OtherRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]   16,000,000us-gaap_OtherRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
Loans held for investment 73,447,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		   73,392,000,000us-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 80.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		   79.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember
Loans held for investment 4,337,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember		   4,827,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_FederallyGuaranteedStudentLoansMember
Residential Guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Loan Portfolio Current 30.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		   28.00%sti_PercentageOfLoanPortfolioCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember
Loans held for investment 655,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember		   632,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sti_ResidentialMortgagesGuaranteedMember
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other Real Estate 61,000,000us-gaap_OtherRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 [1]   75,000,000us-gaap_OtherRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 [1]
Loans held for investment 38,445,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		   38,775,000,000us-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 13,954,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [5]   14,264,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [5]
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 1,500,000,000us-gaap_LoansAndLeasesReceivableForeign
/ us-gaap_ConcentrationRiskByTypeAxis
= sti_CrossBorderOutstandingLoansMember		   1,300,000,000us-gaap_LoansAndLeasesReceivableForeign
/ us-gaap_ConcentrationRiskByTypeAxis
= sti_CrossBorderOutstandingLoansMember
Credit Concentration Risk [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
ResidentialLoansInterestOnlyHighOriginalLTVAndOrSecondLien 738sti_CurrentWeightedAverageFICOScoreonHighLTVResidentialMortgages
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember		   754sti_CurrentWeightedAverageFICOScoreonHighLTVResidentialMortgages
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
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		   29.00%sti_Loansubcategoryasapercentoftotalloans
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember
Government Guarantee Percent 2.00%sti_GovernmentGuaranteePercent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		   2.00%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		   10,900,000,000us-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 5,200,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_OtherCommitmentsAxis
= us-gaap_MortgageLoansOnRealEstateMember		   3,300,000,000us-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 500,000,000us-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		   4,000,000,000us-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 25,200,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		   26,500,000,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember
Line of Credit Facility, Remaining Borrowing Capacity 17,500,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalReserveBankAdvancesMember		   18,400,000,000us-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 31,000,000,000us-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 $ 24,500,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		   $ 24,300,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
[1] Does not include foreclosed real estate related to loans insured by the FHA or the VA. Proceeds due from the FHA and the VA are recorded as a receivable in other assets in the Consolidated Balance Sheets until the funds are received and the property is conveyed. The receivable amount related to proceeds due from the FHA or the VA totaled $61 million and $57 million at March 31, 2015 and December 31, 2014, respectively.
[2] Includes debt of consolidated VIEs of $292 million and $302 million at March 31, 2015 and December 31, 2014, respectively.
[3] Includes loans of consolidated VIEs of $277 million and $288 million at March 31, 2015 and December 31, 2014, respectively.
[4] Nonaccruing restructured loans are included in total nonaccrual/NPLs.
[5] Excludes $655 million and $632 million of guaranteed residential loans at March 31, 2015 and December 31, 2014, respectively.