Obligations under Guarantees and Other Off-balance Sheet Instruments (Tables)
 12 Months Ended
Mar. 31, 2022
Guarantee Obligations And Other Off Balance Sheet Instruments [Abstract]  
Contractual or Notional Amounts of Guarantees with Amount by Expiration Period The contractual or notional amounts summarized in the following table do not necessarily bear any direct relationship to the future actual credit exposure, primarily because of risk management techniques of the MUFG Group.
 
Maximum
 potential/
 Contractual
 or Notional
 amount
 
 
Amount by expiration period
At March 31, 2021: 
1 year
 or less
 1-5 years 
Over
 5 years
 (in billions)
Standby letters of credit and financial guarantees¥4,055 ¥3,174 ¥698 ¥183 
Performance guarantees3,1932,315755123
Derivative instruments(1)
38,49915,53415,1047,861
Liabilities of trust accounts10,6565,6677184,271
Other40634—
Total¥56,443 ¥26,696 ¥17,309 ¥12,438 
        
Maximum
 potential/
 Contractual
 or Notional
 amount
 
 
Amount by expiration period
At March 31, 2022: 
1 year
 or less
 1-5 years 
Over
 5 years
 (in billions)
Standby letters of credit and financial guarantees¥4,731 ¥3,733 ¥784 ¥214 
Performance guarantees3,8282,807887134
Derivative instruments(1)
39,98214,67016,9888,324
Liabilities of trust accounts12,2626,4136725,177
Other71665—
Total¥60,874 ¥27,629 ¥19,396 ¥13,849 
Note:
(1)Credit derivatives sold by the MUFG Group are excluded from this presentation.
Maximum Potential Amount of Future Payments Classified Based upon Internal Credit Ratings Presented in the tables below is the maximum potential amount of future payments classified based upon internal credit ratings as of March 31, 2021 and 2022. The determination of the maximum potential future payments is based on the notional amount of the guarantees without consideration of possible recoveries under recourse provisions or from collateral held or pledged. Such amounts do not represent the anticipated losses, if any, on these guarantees.
   Amount by borrower grade
At March 31, 2021:
Maximum
 potential/
 Contractual
 or Notional
 amount
 Normal 
Close
 Watch(1)
 
Likely to
 become
 Bankrupt
 or Legally/
 Virtually
 Bankrupt(2)
 
Not
 rated
 (in billions)
Standby letters of credit and financial guarantees¥4,055 ¥3,929 ¥108 ¥15 ¥3 
Performance guarantees3,193 3,092 70 3 28 
Total¥7,248 ¥7,021 ¥178 ¥18 ¥31 
 
   Amount by borrower grade
At March 31, 2022:
Maximum
 potential/
 Contractual
 or Notional
 amount
 Normal 
Close
 Watch(1)
 
Likely to
 become
 Bankrupt
 or Legally/
 Virtually
 Bankrupt(2)
 
Not
 rated
 (in billions)
Standby letters of credit and financial guarantees¥4,731 ¥4,575 ¥121 ¥31 ¥4 
Performance guarantees3,828 3,706 73 22 27 
Total¥8,559 ¥8,281 ¥194 ¥53 ¥31 
Notes:
(1)Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons.
(2)Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, suspension of business, voluntary liquidation or filing for legal liquidation.
Contractual Amounts with Regard to Other Off-balance Sheet Instruments The table below presents the contractual amounts with regard to the other off-balance sheet instruments at March 31, 2021 and 2022:
 20212022
 (in billions)
Commitments to extend credit¥84,614 ¥82,886 
Commercial letters of credit835908
Commitments to make investments281478