v3.25.2
Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual or Notional Amounts of Guarantees with Amount by Expiration Period) (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2025
Mar. 31, 2024
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total ¥ 86,790 ¥ 81,144
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 45,910 42,735
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 23,051 20,664
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years 17,829 17,745
Standby letters of credit and financial guarantees    
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total 5,992 5,320
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 4,857 4,335
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 982 818
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years 153 167
Performance guarantees    
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total 4,851 4,788
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 3,480 3,615
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 1,235 1,006
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years 136 167
Derivative instruments    
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total 54,701 51,058
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 23,801 22,245
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 20,040 18,100
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years 10,860 10,713
Liabilities of trust accounts    
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total 21,236 19,938
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 13,762 12,502
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 794 738
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years 6,680 6,698
Other    
Guarantor Obligations [Line Items]    
Maximum potential / Contractual or Notional amount, Total 10 40
Maximum potential / Contractual or Notional amount, Expiring in 1 year or less 10 38
Maximum potential / Contractual or Notional amount, Expiring in 1-5 years 0 2
Maximum potential / Contractual or Notional amount, Expiring in Over 5 years ¥ 0 ¥ 0