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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Statement [Line Items] |  |  |
Net unrealized gains (losses) on investments | ¥ 0 | ¥ 0 |
Net unrealized gains (losses) on investment in securities |  |  |
Statement [Line Items] |  |  |
Net unrealized gains (losses), tax | 41,871 | 21,836 | ¥ 5,702
Reclassification adjustment included in net income, tax | 90 | 61 | 510
Debt valuation adjustments |  |  |
Statement [Line Items] |  |  |
Net unrealized gains (losses), tax | (25) | 121 | 321
Reclassification adjustment included in net income, tax | 5 | 10 | 28
Defined benefit pension plans |  |  |
Statement [Line Items] |  |  |
Net unrealized gains (losses), tax | (1,706) | (4,738) | (2,247)
Reclassification adjustment included in net income, tax | 76 | (151) | (368)
Foreign currency translation adjustments |  |  |
Statement [Line Items] |  |  |
Net unrealized gains (losses), tax | 19,131 | 17,642 | 14,709
Reclassification adjustment included in net income, tax | (1,806) | (295) | (751)
Net unrealized gains (losses) on derivative instruments |  |  |
Statement [Line Items] |  |  |
Net unrealized gains (losses), tax | (3,106) | (3,256) | 40
Reclassification adjustment included in net income, tax | ¥ (408) | ¥ (1,478) | ¥ (1,923)

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL34724391-108580 + Details
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