v3.26.1
Financial risk management - Summary of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities ¥ 4,131,847 ¥ 10,964,623
Deposits from customers in the banking business [1],[2]   4,281,915
Bonds 490,794 688,245
Borrowings 638,704 2,971,250
Loan commitments   27,564
Derivative liabilities 70,216 155,095 [3]
Guarantee deposits received 7,812 45,017
Redeemable noncontrolling interests 81,194 53,750
Lease liabilities 722,527 712,098
Derivative Contracts - Net Settled    
Paid 70,216 155,095
Derivative Contracts Gross Settled    
Received 0 0
Paid 0 0
Deposits from customers in the banking business [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities [1],[2]   4,243,962
Bonds [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities 474,343 664,390
Borrowings [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities 567,643 2,934,386
Derivative Liabilities [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities 70,216 154,526 [3]
Guarantee deposits received [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities 7,812 45,017
Redeemable non-controlling interests [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Financial liabilities 78,568 52,963
Gross carrying amount [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 627,683 599,470
Within 1Year [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   4,006,600
Bonds 128,224 114,299
Borrowings 109,081 1,934,886
Loan commitments   27,564
Derivative liabilities 70,216 21,479 [3]
Guarantee deposits received 0 31,866
Redeemable noncontrolling interests 37,485 10,912
Lease liabilities 115,801 115,608
Derivative Contracts - Net Settled    
Paid 70,216 21,479
Derivative Contracts Gross Settled    
Received 0 0
Paid 0 0
1 Year to 2 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   96,834
Bonds 92,759 128,972
Borrowings 69,467 264,847
Derivative liabilities 0 121,611 [3]
Guarantee deposits received 309 100
Redeemable noncontrolling interests 9,995 21,588
Lease liabilities 106,678 107,197
Derivative Contracts - Net Settled    
Paid 0 121,611
Derivative Contracts Gross Settled    
Received 0  
Paid 0  
2 Years to 3 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   11,141
Bonds 62,450 103,488
Borrowings 160,433 233,755
Derivative liabilities 0 3,173 [3]
Guarantee deposits received 25 21
Redeemable noncontrolling interests 1,974 4,447
Lease liabilities 97,209 94,233
Derivative Contracts - Net Settled    
Paid 0 3,173
Derivative Contracts Gross Settled    
Received 0  
Paid 0  
3 Years to 4 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   2,692
Bonds 121,962 93,160
Borrowings 16,977 157,629
Derivative liabilities 0 2,693 [3]
Guarantee deposits received 10 7
Redeemable noncontrolling interests 9,344 3,405
Lease liabilities 84,213 75,125
Derivative Contracts - Net Settled    
Paid 0 2,693
Derivative Contracts Gross Settled    
Received 0  
Paid 0  
4 Years to 5 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   10,596
Bonds 1,155 162,927
Borrowings 151,655 21,521
Derivative liabilities 0 2,340 [3]
Guarantee deposits received 10 6
Redeemable noncontrolling interests 1,640 2,287
Lease liabilities 67,155 67,715
Derivative Contracts - Net Settled    
Paid 0 2,340
Derivative Contracts Gross Settled    
Received 0  
Paid 0  
5+ Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Deposits from customers in the banking business [1],[2]   154,052
Bonds 84,244 85,399
Borrowings 131,091 358,612
Derivative liabilities 0 3,799 [3]
Guarantee deposits received 7,458 13,017
Redeemable noncontrolling interests 20,756 11,111
Derivative Contracts - Net Settled    
Paid 0 3,799
Derivative Contracts Gross Settled    
Received 0  
Paid 0  
5 Years to 6 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 55,337 52,376
6 Years to 7 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 47,266 42,763
7 years to 8 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 36,423 34,114
8 Years to 9 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 31,878 25,860
9 Years to 10 Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities 27,073 21,529
10+ Years [member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Lease liabilities ¥ 53,494 ¥ 75,578
[1] As a result of the execution of the Partial Spin-off of the Financial Services business, SFGI, which operates the Financial Services business, has been excluded from consolidation. Therefore, there is no balance of depoits from customers in the banking business as of March 31, 2026.
[2] Demand deposits are included in the “Within 1 year” category.
[3] Breakdown of net settlements and gross settlements in the derivative liabilities are presented below.