Fair Value Measurements (Narratives) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Fair Value Measurements [Abstract]
Derivative asset counterparty credit valuation adjustment		$ 1
Derivative liability non-performance credit valuation adjustment	$ 1	$ 1

The amount of non-performance credit valuation adjustments recorded as of the balance sheet date pertaining to derivative liabilities.

No definition available.

Name:	tmcc_FairValueDerivativeLiabilityNonPerformanceCreditValuationAdjustment
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant