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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
Mar. 31, 2025
Mar. 31, 2024
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets ¥ 64,170 ¥ 72,986
Gross amounts offset in the consolidated balance sheets, assets (20,495) (47,496)
Net amounts presented in the consolidated balance sheets, assets 43,675 25,490
Gross amounts not offset in the consolidated balance sheets, financial instruments, assets 0 0
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, assets (557) 0
Net amount, assets 43,118 25,490
Gross amounts recognized, liabilities 56,038 95,686
Gross amounts offset in the consolidated balance sheets, liabilities (20,495) (47,496)
Net amounts presented in the consolidated balance sheets, liabilities 35,543 48,190
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities (13,802) (13,653)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities (12,777) (9,425)
Net amount, liabilities 8,964 25,112
Derivative liabilities    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, liabilities 56,038 95,686
Gross amounts offset in the consolidated balance sheets, liabilities (20,495) (47,496)
Net amounts presented in the consolidated balance sheets, liabilities 35,543 48,190
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities (13,802) (13,653)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities (12,777) (9,425)
Net amount, liabilities 8,964 25,112
Derivative assets    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets 64,170 72,986
Gross amounts offset in the consolidated balance sheets, assets (20,495) (47,496)
Net amounts presented in the consolidated balance sheets, assets 43,675 25,490
Gross amounts not offset in the consolidated balance sheets, financial instruments, assets 0 0
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, assets (557) 0
Net amount, assets ¥ 43,118 ¥ 25,490