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Debt - Debt and Related Weighted Average Contractual Interest Rates (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Debt Instrument [Line Items]    
Debt $ 90,231us-gaap_DebtLongtermAndShorttermCombinedAmount $ 85,367us-gaap_DebtLongtermAndShorttermCombinedAmount
Weighted average contractual interest rates 1.22%us-gaap_DebtWeightedAverageInterestRate 1.26%us-gaap_DebtWeightedAverageInterestRate
Commercial paper [Member]    
Debt Instrument [Line Items]    
Debt 27,006us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember		 27,709us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Weighted average contractual interest rates 0.21%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember		 0.18%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Unsecured notes and loans payable [Member]    
Debt Instrument [Line Items]    
Debt 52,307us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		 49,075us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
Weighted average contractual interest rates 1.86%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		 1.99%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
Secured notes and loans payable [Member]    
Debt Instrument [Line Items]    
Debt 10,837us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember		 8,158us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
Weighted average contractual interest rates 0.60%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember		 0.54%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
Carrying value adjustment [Member]    
Debt Instrument [Line Items]    
Debt $ 81us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= tmcc_DebtCarryingValueAdjustmentMember		 $ 425us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= tmcc_DebtCarryingValueAdjustmentMember
Weighted average contractual interest rates 0.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= tmcc_DebtCarryingValueAdjustmentMember		 0.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= tmcc_DebtCarryingValueAdjustmentMember