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Investment in Affiliates (Combined and Condensed Information Related to Affiliates Including the Affiliates Elected the Fair Value Option) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Operations:      
Total revenues ¥ 2,666,373 ¥ 2,520,365 ¥ 2,292,708
Financial position:      
Total assets 15,266,191 14,270,672 13,563,082
Total Liabilities 11,837,946 10,899,271  
Total equity 3,356,585 3,261,419  
Equity Method Investment, Nonconsolidated Investee, Other [Member]      
Operations:      
Total revenues 1,316,683 1,194,172 1,155,974
Income before income taxes 165,612 108,065 85,667
Net income 129,331 88,572 74,008
Financial position:      
Total assets 16,438,275 14,974,191 12,858,129
Total Liabilities 11,950,087 10,729,973 9,203,980
Total equity ¥ 4,488,188 ¥ 4,244,218 ¥ 3,654,149