ACQUISITIONS - Schedule of Financial Results of Investors (Details) - Investors Acquisition $ in Millions	6 Months Ended
Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Net income	$ 217
Net interest income
Business Acquisition [Line Items]
Net income	450
Noninterest income
Business Acquisition [Line Items]
Net income	$ 27

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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