Allowance for Credit Losses - Past Due Finance Receivables and Investments in Operating Leases (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017
Past Due Finance Receivables and Investments in Operating Leases
Finance receivables	$ 229	$ 192
Investments in operating leases	104	95
Total	$ 333	$ 287

Aggregate amount of financing and leases receivables that are equal to or greater than 60 days past due.

No definition available.

Name:	tmcc_FinancingAndLeasesReceivableEqualToGreaterThan60DaysPastDue
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant