Credit Enhancements Credit Enhancements (Details) - USD ($) $ in Billions	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Credit Enhancements [Abstract]
Credit Enhancement Recovery Receivables	$ 1.0	$ 0.3	$ 0.1

Represents expected recoveries on freestanding credit enhancements.

No definition available.

Name:	fmcc_CreditEnhancementRecoveryReceivables
Namespace Prefix:	fmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant