BENEFITS PAYABLE - Narrative (Details) - USD ($) $ in Billions	Sep. 30, 2025	Sep. 30, 2024
Insurance [Abstract]
Benefits payable including IBNR	$ 6.9	$ 7.2

Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement.

No definition available.

Name:	us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant