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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Disclosure In Tabular Form Of Allowances For Credit Losses And Provision For Credit Losses (Detail) (Parenthetical) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Statement [Line Items] |  |  |  |
Allowance for credit loss on available for sale debt securities |  | ¥ 144 | ¥ 153 | ¥ 120
Provision for credit losses on loans to affiliates | [1] | 361 | 1,449 | 255
Allowance for credit loss on loans to affiliates |  | 649 | 1,957 | 1,050
Other Liabilities [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Allowance for credit losses on off balance sheet exposures |  | ¥ 17,843 | ¥ 22,120 | ¥ 26,094
[1] | The provision for credit losses on loans to affiliates were provisions of ¥255 million, ¥1,449 million and ¥361 million during fiscal 2021, 2022 and 2023, respectively, and the amounts are recorded in “Equity in net income (loss) of affiliates” in the consolidated statements of income. The allowance for credit losses on loans to affiliates were ¥1,050 million, ¥1,957 million and ¥649 million as of March 31, 2021, 2022 and 2023, respectively, and the amounts are recorded as a reduction in “Investments in affiliates” on the consolidated balance sheets.

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- Definition Provision for credit losses on loans to affiliates. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + 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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