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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue	$ 8	$ 26	$ (64)	$ 87
Amortization of Deferred Gain on Retroactive Reinsurance			64	87
Property, Liability and Casualty Insurance Product Line
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(412)	(221)
Prior accident year development before change in deferred gain			(348)	(134)
Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue			(64)	(87)
Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue			(64)	(87)
Segment Reconciling Items | Catastrophe
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(39)	(38)
Segment Reconciling Items | Asbestos and Environmental
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	0
Segment Reconciling Items | Workers' Compensation
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(188)	(188)
Segment Reconciling Items | Workers' Compensation | COVID-19 related Claims
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]				(48)
Segment Reconciling Items | Change in Workers Compensation Discount Including Accretion [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			34	34
Segment Reconciling Items | General Liability [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	81
Segment Reconciling Items | Marine
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	(1)
Segment Reconciling Items | Package Business [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	(6)
Segment Reconciling Items | Property Insurance [Member] | P&C Business Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(28)	(7)
Segment Reconciling Items | Property Insurance [Member] | P&C Personal Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(36)	(15)
Segment Reconciling Items | Professional Liability Insurance [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(11)	(7)
Segment Reconciling Items | Surety Product Line [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(22)	(22)
Segment Reconciling Items | Assumed reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	24
Segment Reconciling Items | Automobiles [Member] | P&C Business Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			0	26
Segment Reconciling Items | Automobiles [Member] | P&C Personal Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			(55)	(13)
Segment Reconciling Items | Uncollectible reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			6	0
Segment Reconciling Items | Insurance, Other [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]			$ (9)	$ (2)

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Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit

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- Definition

Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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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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