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Income Taxes (Total Income Tax Expense Recognized) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Provision for income taxes |  | ¥ 87,500 | ¥ 187,264 | ¥ 90,747
Income tax expense (benefit) allocated to other comprehensive income (loss): |  |  |  |
Net change of unrealized gains (losses) on investment in securities |  | (41,961) | (21,897) | (6,212)
Net change of debt valuation adjustments |  | 20 | (131) | (349)
Net change of defined benefit pension plans |  | 1,630 | 4,889 | 2,615
Net change of foreign currency translation adjustments |  | (17,325) | (17,347) | (13,958)
Net change of unrealized gains (losses) on derivative instruments |  | 3,514 | 4,734 | 1,883
Adjustments to retained earnings for changes in accounting principles | [1] | 0 | (215) | (17,113)
Other direct adjustments to shareholders' equity |  | 36 | 214 | 1,521
Total income tax expense |  | ¥ 33,414 | ¥ 157,511 | ¥ 59,134
[1] | The amount for fiscal 2021 reflects the tax effect of the adoption of Accounting Standards Update 2016-13 (“Measurement of Credit Losses on Financial Instruments”—ASC 326 (“Financial Instruments—Credit Losses”)). The amount for fiscal 2022 reflects the tax effect of the adoption of Accounting Standards Update 2019-12 (“Simplifying the Accounting for Income Taxes”—ASC 740 (“Income Taxes”)). For further information about Income Taxes, see Note 1 “Significant Accounting and Reporting Policies (aa) New accounting pronouncements.”

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- Definition The tax effect of an increase or decrease in contributed capital (for example, deductible expenditures reported as a reduction of the proceeds from issuing capital stock) during the period charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123586238&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324 + Details
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