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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
	Mar. 31, 2025	Mar. 31, 2024
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue	$ 32	$ (24)
Amortization of Deferred Gain on Retroactive Reinsurance	32	24
Property, Liability and Casualty Insurance Product Line
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(122)	(56)
Prior accident year development before change in deferred gain	(90)	(32)
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	(32)	(24)
Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue	(32)	(24)
Segment Reconciling Items | Catastrophe
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
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]	(65)	(67)
Segment Reconciling Items | Workers' Compensation | COVID-19 related Claims
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(20)
Segment Reconciling Items | Change in Workers Compensation Discount Including Accretion [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	12	12
Segment Reconciling Items | General Liability [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	17
Segment Reconciling Items | Marine
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	7
Segment Reconciling Items | Package Business [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
Segment Reconciling Items | Property Insurance [Member] | P&C Business Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(3)	(3)
Segment Reconciling Items | Property Insurance [Member] | P&C Personal Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(18)	0
Segment Reconciling Items | Professional Liability Insurance [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	(5)
Segment Reconciling Items | Surety Product Line [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
Segment Reconciling Items | Assumed reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	9
Segment Reconciling Items | Automobiles [Member] | P&C Business Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
Segment Reconciling Items | Automobiles [Member] | P&C Personal Insurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(12)	0
Segment Reconciling Items | Uncollectible reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
Segment Reconciling Items | Insurance, Other [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	$ (4)	$ (2)

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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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