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Deposits - Summary of Deposits (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Deposits from customers [abstract]    
Non-interest-bearing demand deposits ¥ 31,406,231 ¥ 32,935,364
Interest-bearing demand deposits 83,600,262 80,370,602
Deposits at notice 17,580,666 14,655,807
Time deposits 42,142,744 34,482,582
Negotiable certificates of deposit 15,667,132 17,175,392
Others [1] 11,533,392 10,402,995
Total deposits ¥ 201,930,427 ¥ 190,022,742
[1] Others include, among other items, foreign currency deposits in domestic offices and Japanese yen accounts held by foreign depositors in domestic offices.