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Interest Rate Benchmark Reform - Summary Of Financial Instruments Yet To Be Transitioned To An Alternative Benchmark Rate (Parenthetical) (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2024
Mar. 31, 2023
Hedging instrument [member] | Interest rate benchmark reform [member]    
Disclosure of quantitative information about financial instruments that have yet to transition to alternative benchmark rate [line items]    
Notional amount ¥ 4,716