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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, 2024	Sep. 30, 2024	Sep. 30, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Condensed Balance Sheet Statements, Captions [Line Items]
Amortization of Deferred Gain on Retroactive Reinsurance	$ 26	$ 87
Property, Liability and Casualty Insurance Product Line
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(221)	$ (82)
Prior accident year development before change in deferred gain		(134)	(82)
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		(87)	0
Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue		(87)	0
Segment Reconciling Items | Catastrophe
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(38)	(44)
Segment Reconciling Items | Asbestos and Environmental
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		0	0
Segment Reconciling Items | Accident and Health Insurance Product Line [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(188)	(174)
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] | COVID-19 related Claims
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		48	38
Segment Reconciling Items | Change in Workers Compensation Discount Including Accretion [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		34	32
Segment Reconciling Items | General Liability [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		81	39
Segment Reconciling Items | Marine
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(1)	(1)
Segment Reconciling Items | Package Business [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(6)	(18)
Segment Reconciling Items | Property Insurance [Member] | Commercial Lines
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(7)	2
Segment Reconciling Items | Property Insurance [Member] | Personal Lines
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(15)	1
Segment Reconciling Items | Professional Liability Insurance [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(7)	(3)
Segment Reconciling Items | Surety Product Line [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(22)	12
Segment Reconciling Items | Assumed reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		24	19
Segment Reconciling Items | Automobiles [Member] | Commercial Lines
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		26	6
Segment Reconciling Items | Automobiles [Member] | Personal Lines
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		(13)	0
Segment Reconciling Items | Uncollectible reinsurance
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		0	13
Segment Reconciling Items | Insurance, Other [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]		$ (2)	$ 34

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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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