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Pension and Other Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Employee benefits expense $ 5tmcc_RelatedPartyTransactionDeferredCompensationArrangementWithIndividualCompensationExpense $ 9tmcc_RelatedPartyTransactionDeferredCompensationArrangementWithIndividualCompensationExpense $ 18tmcc_RelatedPartyTransactionDeferredCompensationArrangementWithIndividualCompensationExpense $ 27tmcc_RelatedPartyTransactionDeferredCompensationArrangementWithIndividualCompensationExpense