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Other Income Other Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Component of Other Income, Nonoperating [Line Items]    
Derivative Instruments, Gain/(Loss) recongnized in income, Ineffectiveness Portion and amount not designated as hedging instruments $ 115fmcc_DerivativeInstrumentsGainLossrecongnizedinincomeIneffectivenessPortionandamountnotdesignatedashedginginstruments $ (23)fmcc_DerivativeInstrumentsGainLossrecongnizedinincomeIneffectivenessPortionandamountnotdesignatedashedginginstruments
Foreign Currency Transaction Gain (Loss), Realized (151)us-gaap_ForeignCurrencyTransactionGainLossRealized 7us-gaap_ForeignCurrencyTransactionGainLossRealized
Investment Income, Net 25us-gaap_InvestmentIncomeNet 14us-gaap_InvestmentIncomeNet
Insurance Fee Income 16fmcc_InsuranceFeeIncome 26fmcc_InsuranceFeeIncome
Other Nonoperating Income (Expense) 49us-gaap_OtherNonoperatingIncomeExpense 27us-gaap_OtherNonoperatingIncomeExpense
Other Income Loss Net $ 54fmcc_OtherIncomeLossNet $ 51fmcc_OtherIncomeLossNet