Insurance contracts in the financial services business - Summary of Amounts payable on demand (Detail) ¥ in Millions	Mar. 31, 2025 JPY (¥)
Disclosure of types of insurance contract [Abstract]
Amounts payable on demand	¥ 13,214,887
Carrying amount	¥ 12,642,981

The amounts payable on demand that arise from contracts within the scope of IFRS 17.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2025-01-01
-Paragraph 132
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_132_c&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_AmountsPayableOnDemandThatAriseFromContractsWithinScopeOfIFRS17
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant