Insurance contracts in the financial services business - Summary of disclosure of changes in accumulated other comprehensive income for financial assets (Detail) ¥ in Millions |
12 Months Ended |
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Mar. 31, 2025
JPY (¥)
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| Reconciliation of reserve of gains and losses on financial assets measured at fair value through other comprehensive income related to insurance contracts to which paragraphs C18(b), C19(b), C24(b) and C24(c) of IFRS 17 have been applied [abstract] | |
| Beginning balance of the fiscal year | ¥ 9,445 |
| Net change in fair value | 778,509 |
| Net amount reclassified to profit or loss | 1,142 |
| Related income tax | (225,613) |
| Ending balance of the fiscal year | ¥ 563,483 |