Commitments and contingencies (Tables)

12 Months Ended

Mar. 31, 2026

Commitments And Contingencies Disclosure [Line Items]

Summary of Maximum Potential Amount of Future Payments under Guarantees

The MHFG Group, when necessary, requires collateral such as cash, investment securities and real estate or third-party guarantees depending on the amount of credit risk involved, and employs means such as

sub-participation

to reduce the credit risk associated with guarantees. The maximum exposure or notional amount below does not represent the expected losses from the execution of the guarantees.


	Maximum potential/ Contractual or Notional amount		Amount by expiration period
2025	Maximum potential/ Contractual or Notional amount		One year or less		After one year through five years		After five years

	(in billions of yen)
Performance guarantees		4,100		2,233		1,651		217
Guarantees on loans		220		126		79		15
Guarantees on securities		92		—		92		—
Other guarantees		3,309		2,709		494		106
Guarantees for the repayment of trust principal		11		—		2		8
Liabilities of trust accounts		330		98		61		171
Derivative financial instruments		80,505		38,199		35,858		6,448



	Maximum potential/ Contractual or Notional amount		Amount by expiration period
2026	Maximum potential/ Contractual or Notional amount		One year or less		After one year through five years		After five years

	(in billions of yen)
Performance guarantees		4,777		2,644		1,852		281
Guarantees on loans		244		199		32		12
Guarantees on securities		131		30		101		—
Other guarantees		3,793		3,043		642		109
Guarantees for the repayment of trust principal		7		—		—		7
Liabilities of trust accounts		404		129		51		224
Derivative financial instruments		75,897		44,514		25,480		5,903

Summary of Contractual Amounts with Regard to Undrawn Commitments

The table below summarizes the contractual amounts with regard to these undrawn commitments at March 31, 2025 and 2026:


	2025		2026

	(in billions of yen)
Commitments to extend credit (Note)		119,733		130,737
Commercial letters of credit		1,829		1,879

Total		121,562		132,615

Note:

Commitments to extend credit include commitments to invest in securities.

Schedule of Balance Sheet Information Related to operating lease

The following table presents the consolidated balance sheet information related to operating leases as of March 31, 2025 and 2026:


	2025			2026

	(in millions of yen, except for remaining lease term and discount rate)
Right-of-use assets (Note)		474,361			483,068
Lease liabilities (Note)		502,997			521,941
Weighted average:
Remaining lease term		13.5	years		12.6	years
Discount rate		1.06	%		1.35	%

Note:

Right-of-use

assets and lease liabilities are included in Other assets and Other liabilities, respectively, on the consolidated balance sheets.

Schedule of operating lease cost and supplemental cash flow information

The following table presents lease cost and supplemental information related to operating leases for the fiscal years ended March 31, 2024, 2025 and 2026:


	2024		2025		2026

	(in millions of yen)
Lease cost (Note)		104,314		103,386		103,283
Right-of-use assets obtained in exchange for new lease liabilities		52,831		37,637		88,028
Operating cash flows		83,100		82,634		75,803

Note:

Lease cost for operating leases are included in Occupancy expenses on the consolidated statements of income. The Group’s variable lease costs and costs for leases with terms of twelve months or less are not significant.

Future Minimum Lease Payments for Capitalized Leases and Rental Payments for Operating Leases

The following table shows future lease payments under operating leases as of March 31, 2026:


	As of March 31, 2026

	(in millions of yen)
Fiscal year ending March 31:
2027		75,083
2028		61,426
2029		57,231
2030		50,674


2031		37,883
2032 and thereafter		269,594

Total lease payments		551,891

Amount representing interest		29,951

Total lease liabilities for operating leases		521,941

Performance guarantees, Guarantees on loans, Guarantees on securities and Other guarantees

Commitments And Contingencies Disclosure [Line Items]

Summary of Maximum Potential Amount of Future Payments under Guarantees

The table below presents the maximum potential amount of future payments of performance guarantees, guarantees on loans, guarantees on securities and other guarantees classified based on internal ratings at March 31, 2025 and 2026:


	2025		2026

	(in billions of yen)
Investment grade		5,900		6,755
Non-investment grade		1,821		2,190

Total		7,721		8,945

Note:

Investment grade in the internal rating scale generally corresponds to

BBB-

or above in the external rating scale.