Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - JPY (¥) ¥ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Loans held for sale \| Level 3
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]
Transferd into level 3	¥ 176,055		¥ 176,055
Investment funds
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]
Transferred from level 3		¥ 610		¥ 610