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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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Prior accident years reserve development
Unpaid losses and loss adjustment expenses	$ 41,243	$ 39,659
Reinsurance Recoverables, Gross	7,071	6,622		$ 5,641
Segment Reconciling Items
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	229	246	$ 312
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Prior accident years reserve development
Change in Deferred Gain on Retroactive Reinsurance	0	91	102
Reinsurance Recoverables, Gross	300
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum
Prior accident years reserve development
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	300
Catastrophes | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(62)	(154)	(529)
Asbestos and Environmental
Prior accident years reserve development
Prior accident year development [1]			218
Change in Deferred Gain on Retroactive Reinsurance	229	155	210
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease)	229	155	218
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	256
Asbestos and Environmental | Maximum
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	(2)
Unpaid losses and loss adjustment expenses	2,284
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Maximum
Prior accident years reserve development
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,500
Net asbestos reserves
Prior accident years reserve development
Prior accident year development [1]	162	106	127
Net environmental reserves
Prior accident years reserve development
Prior accident year development [1]	67	49	91
Workers’ compensation | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(204)	(190)	(110)
Unpaid losses and loss adjustment expenses	13,377
Workers’ compensation | COVID-19 related Claims | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	14
Workers’ compensation discount accretion | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	36	35	35
General liability | Abuse Claims [Member]
Prior accident years reserve development
Prior accident year development [1]			254
Unpaid losses and loss adjustment expenses	787
General liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	56	454	237
Unpaid losses and loss adjustment expenses	6,484
Marine [Member] | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	2	1	3
Unpaid losses and loss adjustment expenses	578
Package business | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(39)	(91)	(58)
Unpaid losses and loss adjustment expenses	2,201
Professional liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(11)	(2)	(14)
Unpaid losses and loss adjustment expenses	2,050
Bond | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(32)	(26)	(19)
Unpaid losses and loss adjustment expenses	467
Assumed Reinsurance [Member] | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	19	(6)	(6)
Unpaid losses and loss adjustment expenses	464
Uncollectible reinsurance | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	3	(6)	(8)
Other | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	27	42	54
Property and Casualty Insurance Products
Prior accident years reserve development
Prior accident year development [1]	36	199	(136)
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit	(193)	(47)	(448)
Unpaid losses and loss adjustment expenses	33,083	31,449	29,622	$ 28,261
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	229	246	312
P&C Commercial Lines | Property | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(11)	(26)	(4)
Unpaid losses and loss adjustment expenses	914
P&C Commercial Lines | Automobile liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	38	9	27
Unpaid losses and loss adjustment expenses	1,337
P&C Personal Lines | Property | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(1)	3	7
P&C Personal Lines | Automobile liability | Segment Reconciling Items
Prior accident years reserve development
Prior accident year development [1]	(14)	$ (90)	$ (61)
Unpaid losses and loss adjustment expenses	$ 1,417

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