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Commitments, Guarantees, and Contingent Liabilities - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Commitments for purchase of equipment to be leased at cost |  | ¥ 4,066 |  |
Payments for computer systems under non-cancelable contracts |  | 8,738 | ¥ 8,036 | ¥ 6,486
Estimated construction costs |  | 146,945 | 128,449 |
Total unused credit and capital amount available |  | 458,994 | 436,784 |
Guarantee Obligations Maximum Exposure |  | 1,231,425 | 1,153,273 |
Guarantee Obligations Current Carrying Value |  | 57,456 | 60,458 |
Outstanding principal amount of loans transferred under Delegated Underwriting and Servicing program |  | 2,175,722 | 2,121,074 |
Provision for credit losses for off-balance sheet credit exposure reversal | [1] | 4,542 | 4,449 | 7,437
Other Liabilities [Member] |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Allowance for off-balance sheet credit exposure |  | 17,843 | 22,120 | ¥ 26,094
Corporate Loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Guarantee Obligations Maximum Exposure |  | 479,406 | 436,414 |
Guarantee Obligations Current Carrying Value |  | 5,033 | 4,895 |
Performance Guarantee | Corporate Loans |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Guarantee Obligations Maximum Exposure |  | 494,000 | 563,000 |
Guarantee Obligations Current Carrying Value |  | ¥ 2,309 | ¥ 2,317 |
[1] | The allowance for off-balance sheet credit exposure were ¥26,094 million, ¥22,120 million and ¥17,843 million as of March 31, 2021, 2022 and 2023, respectively, and the amounts are recorded in “Other liabilities” on the consolidated balance sheets. For further information, see Note 30 “Commitments, Guarantees and Contingent Liabilities.”

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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