v3.26.1
Financial Instruments - Schedule of Balance of Financial Liabilities by Repayment Date (Details) - Liquidity Risk - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value ¥ 4,697,454 ¥ 3,781,218
Non-derivative financial liabilities, Contractual cash flow 4,699,157 3,784,216
Contractual cash flow Undrawn loan commitments 10,622,322 9,954,633
Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 4,500,033 3,560,630
Contractual cash flow Undrawn loan commitments 10,622,322 9,954,633
Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 75,460 65,045
Within 2-3 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 99,650 43,436
Within 3-4 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 14,946 94,388
Within 4-5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 4,368 14,578
More than 5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 4,700 6,139
Non-Derivative Financial Liabilities | Deposits    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value 2,952,495 2,385,939
Non-derivative financial liabilities, Contractual cash flow 2,952,536 2,386,132
Non-Derivative Financial Liabilities | Deposits | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 2,935,149 2,371,106
Non-Derivative Financial Liabilities | Deposits | Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 5,118 3,531
Non-Derivative Financial Liabilities | Deposits | Within 2-3 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 4,540 4,065
Non-Derivative Financial Liabilities | Deposits | Within 3-4 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 1,204 695
Non-Derivative Financial Liabilities | Deposits | Within 4-5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 2,222 1,761
Non-Derivative Financial Liabilities | Deposits | More than 5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 4,303 4,974
Non-Derivative Financial Liabilities | Accounts Payable    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value 1,122,338 949,397
Non-derivative financial liabilities, Contractual cash flow 1,122,338 949,397
Non-Derivative Financial Liabilities | Accounts Payable | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 1,122,338 949,396
Non-Derivative Financial Liabilities | Accounts Payable | Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow   1
Non-Derivative Financial Liabilities | Borrowings    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value 564,956 399,578
Non-derivative financial liabilities, Contractual cash flow 566,243 401,819
Non-Derivative Financial Liabilities | Borrowings | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 392,273 202,992
Non-Derivative Financial Liabilities | Borrowings | Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 67,883 59,136
Non-Derivative Financial Liabilities | Borrowings | Within 2-3 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 92,747 37,083
Non-Derivative Financial Liabilities | Borrowings | Within 3-4 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 11,813 91,446
Non-Derivative Financial Liabilities | Borrowings | Within 4-5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 1,376 11,012
Non-Derivative Financial Liabilities | Borrowings | More than 5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 151 150
Non-Derivative Financial Liabilities | Other Financial Liabilities    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value 46,748 33,021
Non-derivative financial liabilities, Contractual cash flow 46,748 33,021
Non-Derivative Financial Liabilities | Other Financial Liabilities | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 46,430 33,017
Non-Derivative Financial Liabilities | Other Financial Liabilities | Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 106 4
Non-Derivative Financial Liabilities | Other Financial Liabilities | Within 2-3 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 106  
Non-Derivative Financial Liabilities | Other Financial Liabilities | Within 3-4 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 106  
Non-Derivative Financial Liabilities | Lease Liabilities    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Book value 9,549 12,097
Non-derivative financial liabilities, Contractual cash flow 9,924 12,661
Non-Derivative Financial Liabilities | Lease Liabilities | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 2,475 2,933
Non-Derivative Financial Liabilities | Lease Liabilities | Within 1-2 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 2,353 2,373
Non-Derivative Financial Liabilities | Lease Liabilities | Within 2-3 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 2,257 2,288
Non-Derivative Financial Liabilities | Lease Liabilities | Within 3-4 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 1,823 2,247
Non-Derivative Financial Liabilities | Lease Liabilities | Within 4-5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 770 1,805
Non-Derivative Financial Liabilities | Lease Liabilities | More than 5 years    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow 246 1,015
Derivative Financial Liabilities | Other Financial Liabilities    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities, Book value 1,368 1,186
Non-derivative financial liabilities, Contractual cash flow 1,368  
Derivative financial liabilities, undiscounted cash flows   1,186
Derivative Financial Liabilities | Other Financial Liabilities | Within 1 year    
Disclosure of financial liabilities [line items]    
Non-derivative financial liabilities, Contractual cash flow ¥ 1,368  
Derivative financial liabilities, undiscounted cash flows   ¥ 1,186