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- Definition

Reinsurance, Excess Retention Unexpired Limit, Amount Reinsured, Per Policy

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No definition available.

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- Definition

Reinsurance Recoverables, Adverse Development Reinsurance

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- Definition

Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]

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No definition available.

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- Definition

Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(10))
-Publisher FASB
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- Definition

Amount of funds held as security for payments to be received under reinsurance contracts.

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- Definition

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://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 40
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-Section 50
-Paragraph 3
-Publisher FASB
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- Definition

Cash payments made for reinsurance during the current period.

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-Paragraph 25
-Subparagraph (g)
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- Definition

Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-SubTopic 605
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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
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-Section 50
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- Definition

Amount per policy of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

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Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer.

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Percentage of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer.

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- Definition

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
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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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RESERVE FOR LOSSES AND LAE - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Dec. 31, 2025
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year				$ 6,585	$ 7,665
Unfavorable (favorable) development on prior year losses				226
Funds held under reinsurance treaties		$ 273		273		$ 273	$ 267
Funds held by reinsureds		1,392		1,392		1,392	1,326
Incurred losses and LAE		2,432	$ 2,837	6,819	8,203
Reinsurance recoverables, adverse development reinsurance agreement		1,300		1,300		1,300	1,300
Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Funds held under reinsurance treaties	$ 5,400
Deferred gain on sale current		9		9		9	3
Policyholder benefits and claims incurred, ceded				1,260			1,300
Reinsurance recoverables, adverse development reinsurance agreement		$ 1,260		1,260		1,260
Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements \| State National Reinsurer
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Payments for reinsurance	1,300
Co-participation per layer	$ 1,300
Reinsurance, excess retention (in percent)	85.70%
Funds held under reinsurance agreement, excess of liability	$ 600
Funds held by reinsureds	$ 250
Reinsurance, excess retention unexpired limit, amount reinsured, per policy				591			597
Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements \| MS Transverse Reinsurance
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Payments for reinsurance						$ 122
Reinsurance, excess retention (in percent)						80.00%
Funds held under reinsurance agreement, excess of liability						$ 400
Incurred losses and LAE						$ 122
Reinsurance, excess retention unexpired limit, amount reinsured, per policy				400			$ 400
Well-Seasoned Reserves
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Unfavorable (favorable) development on prior year losses				(141)
Higher Premiums Earned
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Decrease in earned premium growth				(1,000)
Catastrophe Losses
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year				556
Decrease in earned premium growth				(48)
Washington D.C. Aviation Incident
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year					$ 83
Wildfires and Other Weather Related Events
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year				243
Earthquake
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year				157
Foreign Conflict
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year				146
Attritional Losses
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Unfavorable (favorable) development on prior year losses				366
Well-Seasoned Reserves
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Unfavorable (favorable) development on prior year losses				(197)
Baltimore Bridge collapse
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Unfavorable (favorable) development on prior year losses				$ 57