Pension and Other Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employee benefits expense	$ 7	$ 9	$ 13	$ 18

The compensation expense recognized during the period pertaining to the deferred compensation arrangement with a related party.

No definition available.

Name:	tmcc_RelatedPartyTransactionDeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration