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RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year losses	$ 6,175	$ 6,291
Higher Premiums Earned
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase (decrease) in liability for unpaid claims and claims adjustment expense	604
Catastrophe Losses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase (decrease) in liability for unpaid claims and claims adjustment expense	$ (723)

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Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-3

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Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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