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Reserve for Unpaid Losses and Loss Adjustment Expenses - Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Prior accident years reserve development
Unpaid losses and loss adjustment expenses	$ 42,318	$ 41,243
Reinsurance Recoverables, Gross	7,207	7,069
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	0	0	$ 91
Reinsurance Recoverables, Gross	300
Maximum | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Prior accident years reserve development
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	300
Segment Reconciling Items
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	194	229	246
Catastrophes | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(87)	(62)	(154)
Asbestos and Environmental
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	194	229	155
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease)	194	229	155
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	62
Asbestos and Environmental | Maximum
Prior accident years reserve development
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,500
Asbestos and Environmental | Maximum | Reinsurance Policy, Type [Axis]: Asbestos and Environmental
Prior accident years reserve development
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,500
Asbestos and Environmental | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	0	0	0
Unpaid losses and loss adjustment expenses	2,332
Net asbestos reserves
Prior accident years reserve development
Prior accident year development [1]	156	162	106
Net environmental reserves
Prior accident years reserve development
Prior accident year development [1]	38	67	49
Workers’ compensation | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(236)	(204)	(190)
Unpaid losses and loss adjustment expenses	13,863
Workers’ compensation | COVID-19 related Claims | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(38)	(14)
Workers’ compensation discount accretion | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	42	36	35
General liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	41	56	454
Unpaid losses and loss adjustment expenses	6,328
Marine [Member] | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(2)	2	1
Unpaid losses and loss adjustment expenses	550
Package business | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(24)	(39)	(91)
Unpaid losses and loss adjustment expenses	2,335
Professional liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(2)	(11)	(2)
Unpaid losses and loss adjustment expenses	2,183
Bond | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(27)	(32)	(26)
Unpaid losses and loss adjustment expenses	472
Assumed Reinsurance [Member] | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	34	19	(6)
Unpaid losses and loss adjustment expenses	606
Uncollectible reinsurance | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	13	3	(6)
Other | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	57	27	42
Property and Casualty Insurance Products
Prior accident years reserve development
Prior accident year development [1]	10	36	199
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit	(184)	(193)	(47)
Unpaid losses and loss adjustment expenses	34,044	33,083	31,449	$ 29,622
Property and Casualty Insurance Products | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	194	229	246
P&C Commercial Lines | Property | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(7)	(11)	(26)
Unpaid losses and loss adjustment expenses	811
P&C Commercial Lines | Automobile liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	20	38	9
Unpaid losses and loss adjustment expenses	1,450
P&C Personal Lines | Property | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(6)	(1)	3
P&C Personal Lines | Automobile liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	0	$ (14)	$ (90)
Unpaid losses and loss adjustment expenses	$ 1,599

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