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Collateralized transactions - Securities transferred in repurchase agreements and securities lending transactions (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2019
Mar. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements [1] ¥ 34,154 [2] ¥ 34,880
Securities lending transactions [1] 1,512 [2] ¥ 2,130
Total [2],[3] 35,666  
Equities and convertible securities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 149  
Securities lending transactions 1,223  
Total 1,372  
Japanese government, agency and municipal securities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 742  
Securities lending transactions  
Total 742  
Foreign government, agency and municipal securities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 26,730  
Securities lending transactions 21  
Total 26,751  
Bank and corporate debt securities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 2,330  
Securities lending transactions 98  
Total 2,428  
Commercial mortgage-backed securities ("CMBS") [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 25  
Securities lending transactions  
Total 25  
Residential mortgage-backed securities ("RMBS") [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements [4] 4,001  
Securities lending transactions [4]  
Total [4] 4,001  
Collateralized debt obligations ("CDOs") and other [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 162  
Securities lending transactions  
Total 162  
Investment trust funds and other [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Repurchase agreements 15  
Securities lending transactions 170  
Total ¥ 185  
[1] Includes all recognized balances irrespective of whether they are transacted under a master netting agreement or whether Nomura has obtained sufficient evidence of enforceability of the master netting agreement. Amounts include transactions carried at fair value through election of the fair value option. As of March 31, 2018, the gross balance of reverse repurchase agreements and repurchase agreements which were not transacted under master netting agreements or are documented under master netting agreements for which Nomura has not yet obtained sufficient evidence of enforceability was \1,039 billion and \2,827 billion, respectively. As of March 31, 2018, the gross balance of securities borrowing transactions and securities lending transactions which were not transacted under master netting agreements or are documented under master netting agreements for which Nomura has not yet obtained sufficient evidence of enforceability was \1,049 billion and \177 billion, respectively. As of March 31, 2019, the gross balance of reverse repurchase agreements and repurchase agreements which were not transacted under master netting agreements or are documented under master netting agreements for which Nomura has not yet obtained sufficient evidence of enforceability was \749 billion and \3,575 billion, respectively. As of March 31, 2019, the gross balance of securities borrowing transactions and securities lending transactions which were not transacted under master netting agreements or are documented under master netting agreements for which Nomura has not yet obtained sufficient evidence of enforceability was \1,398 billion and \209 billion, respectively.
[2] Repurchase agreements and securities lending transactions are reported within Collateralized financing-Securities sold under agreements to repurchase and Collateralized financing-Securities loaned in the consolidated balance sheets, respectively. Amounts reported for securities lending transactions also include transactions where Nomura lends securities and receives securities that can be sold or pledged as collateral. Nomura recognizes the securities received at fair value and a liability for the same amount, representing the obligation to return those securities. The liability is reported within Other liabilities in the consolidated balance sheets. The total gross recognized liabilities reported for repurchase agreements and securities lending transactions are consistent with the total gross balances reported in the offsetting disclosures above.
[3] Repurchase agreements and securities lending transactions are reported within Collateralized financing-Securities sold under agreements to repurchase and Collateralized financing-Securities loaned in the consolidated balance sheets, respectively. Amounts reported for securities lending transactions also include transactions where Nomura lends securities and receives securities that can be sold or pledged as collateral. Nomura recognizes the securities received at fair value and a liability for the same amount, representing the obligation to return those securities. The liability is reported within Other liabilities in the consolidated balance sheets. The total gross recognized liabilities reported for repurchase agreements and securities lending transactions are consistent with the total gross balances reported in the offsetting disclosures above.
[4] Includes \3,860 billion of U.S. government sponsored agency mortgage pass through securities and collateralized mortgage obligations.