Equity - Components of Other Comprehensive Income Included in Non-controlling Interests (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure of analysis of other comprehensive income by item [line items]
Remeasurements of defined benefit plans	¥ (15,046)	¥ 26,727	¥ (18,931)
Net changes in revaluation of financial assets measured at fair value through other comprehensive income	131,114	(13,477)	(25,469)
Exchange differences on translating foreign operations	701,925	(162,325)	875,050
Total	892,370	(136,758)	893,359
Non-controlling interests [Member]
Disclosure of analysis of other comprehensive income by item [line items]
Remeasurements of defined benefit plans	(137)	90	186
Net changes in revaluation of financial assets measured at fair value through other comprehensive income	27	155	6
Exchange differences on translating foreign operations	23,224	(316)	18,893
Total	¥ 23,114	¥ (71)	¥ 19,085

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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The amount of other comprehensive income, net of tax, after reclassification adjustments, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income]

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The amount of other comprehensive income, net of tax, related to gains (losses) from changes in the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income applying paragraph 5.7.5 of IFRS 9. [Refer: Other comprehensive income]

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The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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