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Equity Method Investments (Summary of Information Relating to The Equity Method Investees) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Operations:      
Total revenues ¥ 2,874,821 ¥ 2,814,361 ¥ 2,663,659
Financial position:      
Total assets 16,866,251 16,322,100 15,289,385
Total liabilities 12,691,036 12,297,490  
Total equity 4,089,782 3,941,466  
Equity Method Investment, Nonconsolidated Investee, Other [Member]      
Operations:      
Total revenues 5,799,502 2,871,734 1,792,981
Income before income taxes 607,503 266,966 (372,994)
Net income 420,757 198,006 (432,618)
Financial position:      
Total assets 28,275,250 26,689,362 19,563,071
Total liabilities 18,861,607 17,178,962 12,379,335
Total equity ¥ 9,413,643 ¥ 9,510,400 ¥ 7,183,736