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RESERVE FOR LOSSES AND LAE - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year losses	$ 7,132	$ 6,175
Higher Premiums Earned
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase in earned premium growth	730
Catastrophe Losses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase in earned premium growth	$ 229

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-Topic 944
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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 effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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