Financial Liabilities Designated At Fair Value Through Profit Or Loss - Summary of financial instruments designated at fair value through profit or loss (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2026	Mar. 31, 2025
Statement1 [Line Items]
Financial liabilities at fair value through profit or loss	¥ 661,424	¥ 597,846
Borrowings [Member]
Statement1 [Line Items]
Financial liabilities at fair value through profit or loss	343,669	311,137
Debt securities in issue [member]
Statement1 [Line Items]
Financial liabilities at fair value through profit or loss	¥ 317,755	¥ 286,709

- Definition

The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities]

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