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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, 2025
Mar. 31, 2025
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets ¥ 84,038 ¥ 64,170
Gross amounts offset in the consolidated balance sheets, assets (37,649) (20,495)
Net amounts presented in the consolidated balance sheets, assets 46,389 43,675
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] (11,326) (557)
Net amount, assets 35,063 43,118
Gross amounts recognized, liabilities 74,391 56,038
Gross amounts offset in the consolidated balance sheets, liabilities (37,649) (20,495)
Net amounts presented in the consolidated balance sheets, liabilities 36,742 35,543
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities (20,101) (13,802)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities [1] (6,942) (12,777)
Net amount, liabilities 9,699 8,964
Derivative liabilities    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, liabilities 74,391 56,038
Gross amounts offset in the consolidated balance sheets, liabilities (37,649) (20,495)
Net amounts presented in the consolidated balance sheets, liabilities 36,742 35,543
Gross amounts not offset in the consolidated balance sheets, financial instruments, liabilities (20,101) (13,802)
Gross amounts not offset in the consolidated balance sheets, collateral received/pledged, liabilities [1] (6,942) (12,777)
Net amount, liabilities 9,699 8,964
Derivative assets    
Offsetting Asset and Liabilities [Line Items]    
Gross amounts recognized, assets 84,038 64,170
Gross amounts offset in the consolidated balance sheets, assets (37,649) (20,495)
Net amounts presented in the consolidated balance sheets, assets 46,389 43,675
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] (11,326) (557)
Net amount, assets ¥ 35,063 ¥ 43,118
[1] The balances related to enforceable master netting agreements or similar agreements which were not offset in the consolidated balance sheets.