Income Taxes (Reconciliation of the Applicable Statutory Tax Rate to the Effective Tax Rate) (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Reconciliation Of Effective Income Tax Rate, Amount [Abstract] | |||||||||||
| Tax at Japan national statutory tax rate, Amount | [1] | ¥ 431,352 | |||||||||
| Local taxes, net of national income tax effect, Amount | [2] | 20,765 | |||||||||
| Effect of cross-border tax laws, Amount | 2,335 | ||||||||||
| Nontaxable or nondeductible items: | |||||||||||
| Noncontrolling interest income from consolidated VIEs, Amount | (33,077) | ||||||||||
| Others, Amount | (6,827) | ||||||||||
| Tax credits, Amount | (13,693) | ||||||||||
| Change in valuation allowance, Amount | (580) | ||||||||||
| Other adjustments, Amount | (31,329) | ||||||||||
| Total income tax expense | ¥ 359,613 | ¥ 199,532 | ¥ 425,120 | ||||||||
| Reconciliation Of Effective Income Tax Rate, Percent [Abstract] | |||||||||||
| Effective statutory tax rate | 25.59% | [1] | 30.62% | 30.62% | |||||||
| Income not subject to tax | (1.22%) | (0.58%) | |||||||||
| Expenses not deductible for tax purposes | 0.18% | 0.08% | |||||||||
| Tax rate differentials of subsidiaries | (1.35%) | (0.92%) | |||||||||
| Change in valuation allowance | (0.03%) | (0.07%) | (2.34%) | ||||||||
| Change in undistributed earnings of subsidiaries | 1.43% | 0.52% | |||||||||
| Noncontrolling interest income from consolidated VIEs, Percent | (1.96%) | 2.06% | (5.35%) | ||||||||
| Effect of enacted change in tax rates | (0.36%) | [3] | 0.00% | ||||||||
| Foreign tax credit and payments | (1.80%) | 3.80% | |||||||||
| Income excluded from taxable income of enterprise tax | (2.14%) | (1.04%) | |||||||||
| Controlled foreign company rules | 0.03% | 0.06% | |||||||||
| Other | (1.10%) | 1.34% | |||||||||
| Local taxes, net of national income tax effect, Percent | [2] | 1.23% | |||||||||
| Effect of cross-border tax laws, Percent | 0.14% | ||||||||||
| Nontaxable or nondeductible items: | |||||||||||
| Others, Percent | (0.41%) | ||||||||||
| Tax credits, Percent | (0.81%) | ||||||||||
| Other adjustments, Percent | (1.86%) | ||||||||||
| Total income tax expense and effective tax rate | 21.33% | 26.28% | 26.19% | ||||||||
| United States | |||||||||||
| Reconciliation Of Effective Income Tax Rate, Amount [Abstract] | |||||||||||
| Foreign tax effects, Amount | ¥ (21,702) | ||||||||||
| Reconciliation Of Effective Income Tax Rate, Percent [Abstract] | |||||||||||
| Foreign tax effects, Percent | (1.29%) | ||||||||||
| Other jurisdictions | |||||||||||
| Reconciliation Of Effective Income Tax Rate, Amount [Abstract] | |||||||||||
| Foreign tax effects, Amount | ¥ 12,369 | ||||||||||
| Reconciliation Of Effective Income Tax Rate, Percent [Abstract] | |||||||||||
| Foreign tax effects, Percent | 0.73% | ||||||||||
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- Definition Change in valuation allowance, amount. No definition available.
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- Definition Effective income tax rate reconciliation controlled foreign company rules. No definition available.
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- Definition Effective income tax rate reconciliation income excluded from taxable income. No definition available.
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- Definition Effective income tax rate reconciliation tax credit foreign percent. No definition available.
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- Definition Effective income tax rate reconciliation tax rate differentials. No definition available.
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- References No definition available.
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- References No definition available.
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of reported income tax expense (benefit) from difference to expected income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to cross-border tax law. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of reported income tax expense (benefit) from difference to expected income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to cross-border tax law. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of reported income tax benefit (expense) from difference to income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to other reconciling items. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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