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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Operations:      
Total revenues ¥ 2,814,361 ¥ 2,663,659 ¥ 2,508,043
Financial position:      
Total assets 16,322,100 15,289,385 14,280,684
Total Liabilities 12,297,490 11,674,118  
Total equity 3,941,466 3,543,607  
Equity Method Investment, Nonconsolidated Investee, Other [Member]      
Operations:      
Total revenues 2,871,734 1,792,981 1,496,724
Income before income taxes 266,966 (372,994) 835,483
Net income 198,006 (432,618) 801,639
Financial position:      
Total assets 26,689,362 19,563,071 18,503,185
Total Liabilities 17,178,962 12,379,335 11,200,054
Total equity ¥ 9,510,400 ¥ 7,183,736 ¥ 7,303,131