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Derivative Financial Instruments and Hedging (Credit Derivatives) (Detail) - Credit Default Swap - JPY (¥)
¥ in Millions
Sep. 30, 2026
[1]
Mar. 31, 2026
[2]
Credit Derivatives [Line Items]    
Maximum potential amount of future payment under the credit derivative ¥ 1,000 ¥ 1,000
Fair value of the credit derivative ¥ 0 ¥ (2)
[1] Underlying reference company’s credit ratings are A1 or better rated by rating agencies as of September 30, 2026.
[2] Underlying reference company’s credit ratings are A1 or better rated by rating agencies as of March 31, 2026.