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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2016	Dec. 31, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Condensed Balance Sheet Statements, Captions [Line Items]
Change in Deferred Gain on Retroactive Reinsurance	$ 148			$ 209
Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental
Condensed Balance Sheet Statements, Captions [Line Items]
Reinsurance, Amount Retained, Per Policy			$ 1,700
Change in Deferred Gain on Retroactive Reinsurance	788
Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Increase (Decrease) in Deferred Revenue	(61)	$ 0
Segment Reconciling Items | Asbestos and Environmental
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	0
Segment Reconciling Items | Catastrophe
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(38)	(44)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(119)	(113)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items | COVID-19 related Claims
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	20	20
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	23	22
General Liability [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	49	28
Marine | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(1)	(1)
Package Business [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(1)	(8)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(5)	0
Property Insurance [Member] | Personal Lines | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(10)	1
Professional Liability Insurance [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(7)	(3)
Surety Product Line [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(22)	12
Assumed reinsurance | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	24	17
Automobiles [Member] | Commercial Lines | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	10	6
Automobiles [Member] | Personal Lines | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(13)	0
Uncollectible reinsurance | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	12
Insurance, Other [Member] | Segment Reconciling Items
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	0	32
Property, Liability and Casualty Insurance Product Line
Condensed Balance Sheet Statements, Captions [Line Items]
Prior accident year development [1]	(171)	(39)
Prior accident year development before change in deferred gain	(110)	(39)
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	$ (61)	$ 0

X

- Definition

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

+ References

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

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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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