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Other Income, Net Of Losses (Schedule of Other Income, Net Of Losses) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Nonoperating Income (Expense) [Abstract]    
Income (Loss) from Equity Method Investments $ 33us-gaap_IncomeLossFromEquityMethodInvestments $ 4us-gaap_IncomeLossFromEquityMethodInvestments
Remarketing Fees 28ally_RemarketingFees 28ally_RemarketingFees
Fees and Commissions, Other 22us-gaap_FeesAndCommissionsOther 23us-gaap_FeesAndCommissionsOther
Other Income 14us-gaap_OtherIncome 12us-gaap_OtherIncome
Other income, net of losses $ 97us-gaap_NoninterestIncomeOtherOperatingIncome $ 67us-gaap_NoninterestIncomeOtherOperatingIncome