v3.26.1
Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Hedges of net investment in foreign operations) (Detail) - Hedges of net investment in foreign operations - Derivatives designated as hedging instruments - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Borrowings and bonds in foreign currencies      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) recognized in other comprehensive income on derivative and others ¥ (1,759) ¥ (13,601) ¥ (97,221)
Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) recognized in other comprehensive income on derivative and others (14,009) 1,488 (41,341)
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Borrowings and bonds in foreign currencies      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) reclassified from other comprehensive income (loss) into income 0 0 0
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) reclassified from other comprehensive income (loss) into income 9,645 (15,995) (87)
Interest expense | Borrowings and bonds in foreign currencies      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) reclassified from other comprehensive income (loss) into income 0 0 0
Interest expense | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) reclassified from other comprehensive income (loss) into income ¥ 8,430 ¥ 10,597 ¥ 14,865