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Income Taxes (Schedule of 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 Credit Carryforwards $ 1,911us-gaap_DeferredTaxAssetsTaxCreditCarryforwards $ 1,874us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred Tax Assets, Tax Loss Carryforward 1,158ally_DeferredTaxAssetsTaxLossCarryforward 1,624ally_DeferredTaxAssetsTaxLossCarryforward
Deferred Tax Asset, Mark-to-market on consumer finance receivables and loans 349ally_DeferredTaxAssetMarkToMarketOnConsumerFinanceReceivablesAndLoans 721ally_DeferredTaxAssetMarkToMarketOnConsumerFinanceReceivablesAndLoans
Deferred Tax Assets, State and local taxes 227ally_DeferredTaxAssetsStateAndLocalTaxes 297ally_DeferredTaxAssetsStateAndLocalTaxes
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses 171us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 257us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve 141us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve 140us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Deferred Tax Assets, Hedging Transactions 139us-gaap_DeferredTaxAssetsHedgingTransactions 177us-gaap_DeferredTaxAssetsHedgingTransactions
Deferred Tax Assets, Basis Difference in Subsidiaries 17ally_DeferredTaxAssetsBasisDifferenceinSubsidiaries 0ally_DeferredTaxAssetsBasisDifferenceinSubsidiaries
Deferred Tax Assets, ResCap Accrual 0ally_DeferredTaxAssetsRescapAccrual 53ally_DeferredTaxAssetsRescapAccrual
Deferred Tax Assets, Other 193us-gaap_DeferredTaxAssetsOther 247us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 4,306us-gaap_DeferredTaxAssetsGross 5,390us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (734)us-gaap_DeferredTaxAssetsValuationAllowance (1,154)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 3,572us-gaap_DeferredTaxAssetsNet 4,236us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Leasing Arrangements 1,148us-gaap_DeferredTaxLiabilitiesLeasingArrangements 1,527us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Deferred tax liabilities, deferred expense, deferred acqusition cost 378ally_DeferredTaxLiabilitiesDeferredExpenseDeferredAcqusitionCost 351ally_DeferredTaxLiabilitiesDeferredExpenseDeferredAcqusitionCost
Deferred Tax Liabilities, Financing Arrangements 161us-gaap_DeferredTaxLiabilitiesFinancingArrangements 191us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Deferred Tax Liabilities, Sales of finance receivables and loans 16ally_DeferredTaxLiabilitiesSalesoffinancereceivablesandloans 26ally_DeferredTaxLiabilitiesSalesoffinancereceivablesandloans
Deferred Tax Liabilities, Basis Difference in Subsidiaries 0ally_DeferredTaxLiabilitiesBasisDifferenceInSubsidiaries 55ally_DeferredTaxLiabilitiesBasisDifferenceInSubsidiaries
Deferred Tax Liabilities, Other 62us-gaap_DeferredTaxLiabilitiesOther 46us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 1,765us-gaap_DeferredIncomeTaxLiabilities 2,196us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Assets, Net 1,807us-gaap_DeferredTaxAssetsLiabilitiesNet 2,040us-gaap_DeferredTaxAssetsLiabilitiesNet
Other Assets 7,302us-gaap_OtherAssets 9,589us-gaap_OtherAssets
Accrued expenses and other liabilities 1,735us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent 2,397us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Deferred Tax Asset [Member]    
Deferred Tax Assets and Liabilities [Line Items]    
Other Assets 1,812us-gaap_OtherAssets
/ us-gaap_InformationByFinancialStatementLineItemAxis
= ally_DeferredTaxAssetMember		  
Deferred Tax Liability [Member]    
Deferred Tax Assets and Liabilities [Line Items]    
Accrued expenses and other liabilities $ 5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_InformationByFinancialStatementLineItemAxis
= ally_DeferredTaxLiabilityMember