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Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets and Liabilities [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses $ 710us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 795us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 358us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 463us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 201us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 208us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferred Tax Assets, Other Comprehensive Loss 56us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 153us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Deferred Tax Assets, Other 127us-gaap_DeferredTaxAssetsOther 131us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 1,452us-gaap_DeferredTaxAssetsGross 1,750us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (98)us-gaap_DeferredTaxAssetsValuationAllowance (102)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 1,354us-gaap_DeferredTaxAssetsNet 1,648us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Leasing Arrangements 762us-gaap_DeferredTaxLiabilitiesLeasingArrangements 804us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Deferred Tax Liabilities, Compensation and Benefits 113sti_DeferredTaxLiabilitiesCompensationAndBenefits 97sti_DeferredTaxLiabilitiesCompensationAndBenefits
Deferred Tax Liabilities, Mortgage Servicing Rights 515us-gaap_DeferredTaxLiabilitiesMortgageServicingRights 566us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Deferred Tax Liabilities Loans 93sti_DeferredTaxLiabilitiesLoans 98sti_DeferredTaxLiabilitiesLoans
Deferred Tax Liabilities, Goodwill and Intangible Assets 190us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 151us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Deferred Tax Liabilities, Property, Plant and Equipment 140us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 153us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Other 61us-gaap_DeferredTaxLiabilitiesOther 53us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 1,874us-gaap_DeferredIncomeTaxLiabilities 1,922us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Liabilities, Net $ 520us-gaap_DeferredTaxLiabilities $ 274us-gaap_DeferredTaxLiabilities