Name:	mufg_FloorPercentageOfCorridorDefinedForAmortizationOfNetActuarialGainsAndLosses
Namespace Prefix:	mufg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Number of months of loans contractually past due before being placed on nonaccrual status, in 'PnM' format.

No definition available.

Name:	mufg_LoansContractuallyPastDueBeforeBeingPlacedOnNonaccrualStatusPeriod
Namespace Prefix:	mufg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Threshold of "more likely than not" recognition for a tax position which is measured to determine the amount of benefit to recognize.

No definition available.

Name:	mufg_MoreLikelyThanNotRecognitionThresholdTaxPositionIsMeasured
Namespace Prefix:	mufg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of increase (decrease) to net income attributable to MUFG as the effect of recording intervening events, not recognized for the fiscal year.

No definition available.

Name:	mufg_NetIncomeLossNotRecognizedForFiscalYear
Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Period for determining allowances for credit losses, in 'PnY' format.

No definition available.

Name:	mufg_PeriodForDeterminingAllowancesForCreditLosses
Namespace Prefix:	mufg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mufg_KrungsriPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	mufg_StatementEquityParentComponentsAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	mufg_StatementEquityParentComponentsAxis=mufg_AverageHistoricalLossInformationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: