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Income Taxes Income Tax Rate Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Rate Reconciliation [Line Items]      
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 793us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 583us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 970us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income Tax Reconciliation, State and Local Income Taxes 12us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 21us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (9)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Income Tax Reconciliation, Tax Exempt Income 89us-gaap_IncomeTaxReconciliationTaxExemptIncome 80us-gaap_IncomeTaxReconciliationTaxExemptIncome 77us-gaap_IncomeTaxReconciliationTaxExemptIncome
Effective Income Tax Rate Reconciliation, Tax Exempt Income (3.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (4.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Effective Income Tax Rate Reconciliation, Internal Restructuring 0sti_EffectiveIncomeTaxRateReconciliationInternalRestructuring (343)sti_EffectiveIncomeTaxRateReconciliationInternalRestructuring 0sti_EffectiveIncomeTaxRateReconciliationInternalRestructuring
Effective Income Tax Rate Reconciliation, Internal Restructuring Percentage 0.00%sti_EffectiveIncomeTaxRateReconciliationInternalRestructuringPercentage (20.60%)sti_EffectiveIncomeTaxRateReconciliationInternalRestructuringPercentage 0.00%sti_EffectiveIncomeTaxRateReconciliationInternalRestructuringPercentage
Effective Income Tax Rate Reconciliation, Changes in UTBs, Amount (82)sti_EffectiveIncomeTaxRateReconciliationChangesinUTBsAmount 152sti_EffectiveIncomeTaxRateReconciliationChangesinUTBsAmount 1sti_EffectiveIncomeTaxRateReconciliationChangesinUTBsAmount
Effective Income Tax Rate Reconciliation, Internal Restructuring Percent (3.60%)sti_EffectiveIncomeTaxRateReconciliationChangeinUTBsPercent 9.10%sti_EffectiveIncomeTaxRateReconciliationChangeinUTBsPercent 0.00%sti_EffectiveIncomeTaxRateReconciliationChangeinUTBsPercent
Income Tax Reconciliation, Tax Credits 65us-gaap_IncomeTaxReconciliationTaxCredits [1] 53us-gaap_IncomeTaxReconciliationTaxCredits 58us-gaap_IncomeTaxReconciliationTaxCredits
Effective Income Tax Rate Reconciliation, Tax Credits (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits [1] (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount (57)us-gaap_IncomeTaxReconciliationNondeductibleExpense 49us-gaap_IncomeTaxReconciliationNondeductibleExpense 16us-gaap_IncomeTaxReconciliationNondeductibleExpense
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Income Tax Reconciliation, Other Adjustments (19)us-gaap_IncomeTaxReconciliationOtherAdjustments (7)us-gaap_IncomeTaxReconciliationOtherAdjustments (31)us-gaap_IncomeTaxReconciliationOtherAdjustments
Effective Income Tax Rate Reconciliation, Other Adjustments (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income Tax Expense (Benefit) 493us-gaap_IncomeTaxExpenseBenefit [2] 322us-gaap_IncomeTaxExpenseBenefit [2] 812us-gaap_IncomeTaxExpenseBenefit [2]
Effective Income Tax Rate, Continuing Operations 21.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 19.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Investments [Member]      
Income Tax Rate Reconciliation [Line Items]      
Income Tax Reconciliation, Tax Credits $ 21us-gaap_IncomeTaxReconciliationTaxCredits
/ sti_TaxCreditTypeAxis
= us-gaap_InvestmentsMember		    
[1] 1 Excludes tax credits of $21 million for the year ended December 31, 2014, which were recognized as a reduction to the related investment asset.
[2] Amortization expense related to qualified affordable housing investment costs is recognized in provision for income taxes for each of the periods presented as allowed by an accounting standard adopted in 2014. Prior to 2014, these amounts were recognized in other noninterest expense.