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v3.23.3

Commitments, Guarantees, and Contingent Liabilities - Additional Information (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Commitments for purchase of equipment to be leased at cost |  |  | ¥ 9,786 |  | ¥ 4,066
Payments for computer systems under non-cancelable contracts | ¥ 2,132 | ¥ 2,055 | 4,240 | ¥ 4,138 |
Estimated construction costs | 119,923 |  | 119,923 |  | 146,945
Total unused credit and capital amount available | 493,570 |  | 493,570 |  | 458,994
Guarantee Obligations Maximum Exposure | 1,316,556 |  | 1,316,556 |  | 1,231,425
Guarantee Obligations Current Carrying Value | 57,485 |  | 57,485 |  | 57,456
Outstanding principal amount of loans transferred under Delegated Underwriting and Servicing program | 2,543,499 |  | 2,543,499 |  | 2,175,722
Provision for credit losses in the consolidated statements of income | 171 | ¥ (225) | 591 | ¥ (868) |
Investment in securities pledged for primarily collateral deposits | 367,973 |  | 367,973 |  | 407,495
Investments In Subsidaries Pledged | 9,530 |  | 9,530 |  | 9,911
Other liabilities |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Allowance for off-balance sheet credit exposure | 18,783 |  | 18,783 |  | 17,843
Secured By Share |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Secured debt | 31,407 |  | 31,407 |  | 31,379
Secured Investments |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Secured debt | 166,216 |  | 166,216 |  | 101,827
Corporate Loans |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Guarantee Obligations Maximum Exposure | 485,438 |  | 485,438 |  | 479,406
Guarantee Obligations Current Carrying Value | 4,729 |  | 4,729 |  | 5,033
Performance Guarantee | Corporate Loans |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Guarantee Obligations Maximum Exposure | 494,000 |  | 494,000 |  | 494,000
Guarantee Obligations Current Carrying Value | ¥ 2,188 |  | ¥ 2,188 |  | ¥ 2,309

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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481047/942-405-50-1 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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