v3.26.1
Fair Value (Carrying Amounts and Fair Values of Certain Financial Instruments, Excluding Financial Instruments Carried at Fair Value on a Recurring Basis and Those outside Scope of ASC 825) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Financial liabilities:    
Other short-term borrowings ¥ 106,746 ¥ 244,157
Long-term debt 4,693,080 3,764,171
Carrying amount    
Financial assets:    
Cash and due from banks, interest-bearing deposits in other banks, call loans and funds sold, and receivables under resale agreements and securities borrowing transactions 95,986,000 104,399,000
Investments 4,852,000 4,186,000
Loans, net of allowance [1] 104,910,000 98,275,000
Financial liabilities:    
Noninterest-bearing deposits, call money and funds purchased, and payables under repurchase agreements and securities lending transactions 77,433,000 77,163,000
Interest-bearing deposits 144,596,000 139,443,000
Due to trust accounts 302,000 303,000
Other short-term borrowings 2,816,000 5,293,000
Long-term debt 16,119,000 11,119,000
Estimated fair value    
Financial assets:    
Cash and due from banks, interest-bearing deposits in other banks, call loans and funds sold, and receivables under resale agreements and securities borrowing transactions 95,986,000 104,399,000
Investments 4,711,000 4,027,000
Loans, net of allowance [1] 105,804,000 99,450,000
Financial liabilities:    
Noninterest-bearing deposits, call money and funds purchased, and payables under repurchase agreements and securities lending transactions 77,433,000 77,163,000
Interest-bearing deposits 144,400,000 139,338,000
Due to trust accounts 302,000 303,000
Other short-term borrowings 2,816,000 5,293,000
Long-term debt 15,873,000 10,900,000
Estimated fair value | Level 1    
Financial assets:    
Cash and due from banks, interest-bearing deposits in other banks, call loans and funds sold, and receivables under resale agreements and securities borrowing transactions 60,583,000 71,405,000
Investments 393,000 400,000
Estimated fair value | Level 2    
Financial assets:    
Cash and due from banks, interest-bearing deposits in other banks, call loans and funds sold, and receivables under resale agreements and securities borrowing transactions 35,403,000 32,994,000
Investments 4,318,000 3,628,000
Financial liabilities:    
Noninterest-bearing deposits, call money and funds purchased, and payables under repurchase agreements and securities lending transactions 77,433,000 77,163,000
Interest-bearing deposits 144,400,000 139,338,000
Due to trust accounts 302,000 303,000
Other short-term borrowings 2,816,000 5,293,000
Long-term debt 14,236,000 9,378,000
Estimated fair value | Level 3    
Financial assets:    
Loans, net of allowance [1] 105,804,000 99,450,000
Financial liabilities:    
Long-term debt ¥ 1,637,000 ¥ 1,521,000
[1] Loans, net of allowance include items measured at fair value on a nonrecurring basis.