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Debt - Additional Information (Details) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]      
Debt $ 90,231,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount $ 85,367,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount  
Increase (decrease) in carrying value adjustment on debt (344,000,000)tmcc_DebtInstrumentIncreaseDecreaseCarryingValueAdjustment    
Interest payments 1,000,000,000us-gaap_InterestExpenseDebt 1,100,000,000us-gaap_InterestExpenseDebt 1,300,000,000us-gaap_InterestExpenseDebt
Commercial paper [Member]      
Debt Instrument [Line Items]      
Commercial paper average remaining maturity As of March 31, 2015, our commercial paper had a weighted average remaining maturity of 81 days    
Commercial paper average remaining maturity period 81 days    
Debt 27,006,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
27,709,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
 
Secured notes and loans payable [Member]      
Debt Instrument [Line Items]      
Debt maturity dates As of March 31, 2015, our notes and loans payable mature on various dates through fiscal 2047.    
Debt maturity year 2047    
Debt 10,837,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
8,158,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
 
Secured notes and loans payable [Member] | Floating rate [Member]      
Debt Instrument [Line Items]      
Contractual interest rate, minimum 0.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
0.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
 
Contractual interest rate, maximum 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
1.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
 
Secured notes and loans payable [Member] | Fixed rate [Member]      
Debt Instrument [Line Items]      
Contractual interest rate, minimum 0.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
0.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
 
Contractual interest rate, maximum 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
1.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
 
Unsecured notes and loans payable [Member]      
Debt Instrument [Line Items]      
Debt 52,307,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
49,075,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
 
Debt denominated in foreign currency 12,400,000,000tmcc_DebtInstrumentDenominatedInForeignCurrency
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
12,600,000,000tmcc_DebtInstrumentDenominatedInForeignCurrency
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
 
Unsecured notes and loans payable [Member] | Floating rate [Member]      
Debt Instrument [Line Items]      
Debt 17,400,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
17,600,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
 
Contractual interest rate, minimum 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
 
Contractual interest rate, maximum 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
3.30%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FloatingInterestRateMember
 
Unsecured notes and loans payable [Member] | Fixed rate [Member]      
Debt Instrument [Line Items]      
Debt $ 35,000,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
$ 31,900,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
 
Contractual interest rate, minimum 0.80%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
0.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
 
Contractual interest rate, maximum 9.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember
9.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember
/ tmcc_DebtInterestRateTypeAxis
= tmcc_FixedInterestRateMember