Income Taxes (Tax Effects of Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
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|---|---|---|---|---|
| Income Taxes [Line Items] | ||||
| Deferred Tax Assets, Other | [1] | ¥ 188,081 | ¥ 159,391 | |
| Related To Changes In Foreign Exchange Rate [Member] | ||||
| Income Taxes [Line Items] | ||||
| Deferred Tax Assets, Other | ¥ 107,235 | ¥ 96,778 | ||
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