v3.26.1
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings (Tables)
 12 Months Ended
Mar. 31, 2026
Disclosure of Repurchase Agreements [Abstract]  
Gross Obligations by Remaining Contractual Maturity and Class of Collateral Pledged
 March 31, 2025
 Remaining Contractual Maturity
 
Overnight
 and open
 
30 days
 or less
 
31-90
 days
 
Over
 90 days
 Total
 (in billions)
Payables under repurchase agreements¥10,579 ¥29,902 ¥4,754 ¥1,146 ¥46,381 
Payables under securities lending transactions717 3 — 17 737 
Obligations to return securities received as collateral5,185 399 155 308 6,047 
Total¥16,481 ¥30,304 ¥4,909 ¥1,471 ¥53,165 
 March 31, 2026
 Remaining Contractual Maturity
 
Overnight
 and open
 
30 days
 or less
 
31-90
 days
 
Over
 90 days
 Total
 (in billions)
Payables under repurchase agreements¥9,471 ¥28,467 ¥3,349 ¥1,005 ¥42,292 
Payables under securities lending transactions1,234 18 — — 1,252 
Obligations to return securities received as collateral6,260 173 862 1,173 8,468 
Total¥16,965 ¥28,658 ¥4,211 ¥2,178 ¥52,012 
Secured Borrowing by the Class of Collateral Pledged
Secured borrowing by the class of collateral pledged at March 31, 2025 and 2026 was as follows:
 March 31, 2025
 
Payables under
 repurchase
 agreements
 
Payables under
 securities lending
 transactions
 
Obligations
 to return
 securities received
 as collateral
 Total
 (in billions)
Japanese national government and Japanese government agency bonds¥16,652 ¥165 ¥3,438 ¥20,255 
Foreign government and official institution bonds16,955 30 917 17,902 
Corporate bonds1,012 — 358 1,370 
Residential mortgage-backed securities10,695 — — 10,695 
Other debt securities190 — 2 192 
Marketable equity securities846 531 1,332 2,709 
Other31 11 — 42 
Total¥46,381 ¥737 ¥6,047 ¥53,165 
        
 March 31, 2026
 
Payables under
 repurchase
 agreements
 
Payables under
 securities lending
 transactions
 
Obligations
 to return
 securities received
 as collateral
 Total
 (in billions)
Japanese national government and Japanese government agency bonds¥9,738 ¥560 ¥3,196 ¥13,494 
Foreign government and official institution bonds22,887 11 1,981 24,879 
Corporate bonds992 — 442 1,434 
Residential mortgage-backed securities6,990 — 6 6,996 
Other debt securities360 — 3 363 
Marketable equity securities1,315 640 2,840 4,795 
Other10 41 — 51 
Total¥42,292 ¥1,252 ¥8,468 ¥52,012