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Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Forward Contract Indexed to Issuer's Equity [Line Items]    
Derivative, Notional Amount $ 81,200invest_DerivativeNotionalAmount $ 101,221invest_DerivativeNotionalAmount
Cash and securities collateral placed with counterparties 236ally_CashAndSecuritiesCollateralPlacedWithCounterparties 328ally_CashAndSecuritiesCollateralPlacedWithCounterparties
Non-derivative collateral placed with counterparties 18ally_Nonderivativecollateralplacedwithcounterparties 18ally_Nonderivativecollateralplacedwithcounterparties
Cash collateral received from counterparties 71ally_CashCollateralReceivedFromCounterparties 159ally_CashCollateralReceivedFromCounterparties
noncash collateral received $ 15ally_NoncashCollateralReceived $ 18ally_NoncashCollateralReceived