Income Taxes - Schedule of Unused Tax Losses (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	¥ 1,183,701	¥ 1,186,106
Deductible temporary differences	427,373	263,143
Unused tax credits	26,993	23,724
Less than 5 years
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax credits	3,715	3,901
1st year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	114	812
2nd year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	1,278	85
3rd year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	2,375	1,989
4th year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	549,705	6,233
5th year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	469,391	578,648
After 5th year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	152,121	590,813
Unused tax credits	23,278	19,823
Indefinite
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	8,717	7,526
Unused tax credits	¥ 0	¥ 0

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2024-03-27

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The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

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The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

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