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Offsetting Assets and Liabilities (Gross Amounts Recognized, Gross Amounts Offset, and Net Amounts Presented in Consolidated Balance Sheets Regarding to Derivative Assets and Liabilities and Other Assets and Liabilities) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2023
Mar. 31, 2023
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets ¥ 100,941 ¥ 72,398
Gross amounts offset in the consolidated balance sheets, assets (44,593) (22,052)
Net amounts presented in the consolidated balance sheets, assets 56,348 50,346
Gross amounts not offset in the consolidated balance sheets, financial instruments, assets [1] 0 0
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, assets [1] (2,107) (4,973)
Net amount, assets 54,241 45,373
Gross amounts recognized, liabilities 100,544 71,366
Gross amounts offset in the consolidated balance sheets, liabilities (44,593) (22,052)
Net amounts presented in the consolidated balance sheets, liabilities 55,951 49,314
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities [1] (8,828) (1,786)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities [1] (3,167) (509)
Net amount, liabilities 43,956 47,019
Derivative liabilities    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, liabilities 100,544 71,366
Gross amounts offset in the consolidated balance sheets, liabilities (44,593) (22,052)
Net amounts presented in the consolidated balance sheets, liabilities 55,951 49,314
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities [1] (8,828) (1,786)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities [1] (3,167) (509)
Net amount, liabilities 43,956 47,019
Derivative assets    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets 100,941 72,398
Gross amounts offset in the consolidated balance sheets, assets (44,593) (22,052)
Net amounts presented in the consolidated balance sheets, assets 56,348 50,346
Gross amounts not offset in the consolidated balance sheets, financial instruments, assets [1] 0 0
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, assets [1] (2,107) (4,973)
Net amount, assets ¥ 54,241 ¥ 45,373
[1] The balances related to enforceable master netting agreements or similar agreements which were not offset in the consolidated balance sheets.