Deposits (Narrative) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2024	Mar. 31, 2023
Deposits [Line Items]
Time deposits, including certificates of deposits ("CDs"), issued in amount of JPY10 million or more, Domestic deposits	¥ 65,857,695	¥ 60,245,700
Minimum
Deposits [Line Items]
Issue amount of domestic time deposits in Japanese Yen	¥ 10

The aggregate amount of domestic time deposits (including certificates of deposits), issued in amount of JPY10 million or more.

No definition available.

Name:	mufg_TimeDepositsIssuedInRequiredAmountOrMoreDomestic
Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant