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RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year losses	$ 3,927	$ 3,668
Estimated and recognized reinsurance recoveries	2,175	$ 1,986	$ 2,105	$ 1,946
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	317
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	(58)
Hurricane
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Estimated and recognized reinsurance recoveries	$ 30

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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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-Topic 944
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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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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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