v3.26.3
Credit Quality of Financial Assets and the Allowance for Credit Losses - Additional Information (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2026
Mar. 31, 2026
Financing Receivable, Modifications [Line Items]    
Mortgage loans eligible for repurchase ¥ 52,725 ¥ 76,395