Financial instruments - Summary of Income and Expenses Related to Financial Instruments in the Financial Services Segment (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Income
Dividend income	¥ 70	¥ 5
Financial Services [Member]
Income
Net gains (losses) recognized in profit or loss	333,717	449,449
Total interest income	212,845	195,213
Dividend income	85	2
Expenses
Total interest expenses	3,838	4,577
Impairment losses (gains) on financial assets	43	3
Financial Services [Member] \| Financial liabilities measured at AC [member]
Income
Net gains (losses) recognized in profit or loss	(49,110)	(5,569)
Expenses
Total interest expenses	3,838	4,577
Financial Services [Member] \| Financial instruments required to be measured at FVPL [member]
Income
Net gains (losses) recognized in profit or loss	225,922	412,957
Financial Services [Member] \| Financial instruments designated to be measured at FVPL [member]
Income
Net gains (losses) recognized in profit or loss	(6,673)	4,936
Financial Services [Member] \| Financial assets measured at AC [member]
Income
Net gains (losses) recognized in profit or loss	14,765	(14,069)
Total interest income	32,839	26,141
Expenses
Impairment losses (gains) on financial assets	19	(15)
Financial Services [Member] \| Debt instruments measured at FVOCI [member]
Income
Net gains (losses) recognized in profit or loss	148,813	51,194
Total interest income	180,006	169,072
Expenses
Impairment losses (gains) on financial assets	24	18
Financial Services [Member] \| Equity instruments measured at FVOCI [member]
Income
Dividend income	¥ 85	¥ 2

The amount of dividends related to investments in equity instruments that the entity has designated at fair value through other comprehensive income, derecognised during the reporting period. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
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The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
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-IssueDate 2021-01-01
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The amount of interest expense for financial liabilities that are not at fair value through profit or loss. [Refer: At fair value [member]; Interest expense; Financial liabilities]

+ References

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The amount of income arising from interest for financial assets that are not at fair value through profit or loss. [Refer: Interest income]

+ References

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Net gains losses recognized In profit or loss on financial instruments.

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