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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions	9 Months Ended		28 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Adverse Development Cover Navigators Group [Member]
Prior accident year development [1]			$ 382
Increase (Decrease) in Deferred Revenue	$ 73	$ 97
Segment Reconciling Items | Catastrophe
Prior accident year development [1]	(98)	(413)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items
Prior accident year development [1]	(113)	(72)
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items
Prior accident year development [1]	26	27
General Liability [Member] | Segment Reconciling Items
Prior accident year development [1]	451	112
Marine | Segment Reconciling Items
Prior accident year development [1]	0	1
Package Business [Member] | Segment Reconciling Items
Prior accident year development [1]	(66)	(24)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items
Prior accident year development [1]	(24)	(6)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	2	3
Professional Liability Insurance [Member] | Segment Reconciling Items
Prior accident year development [1]	(7)	(16)
Surety Product Line [Member] | Segment Reconciling Items
Prior accident year development [1]	(26)	(10)
Assumed reinsurance | Segment Reconciling Items
Prior accident year development [1]	0	(7)
Automobiles [Member] | Commercial Lines | Segment Reconciling Items
Prior accident year development [1]	9	27
Automobiles [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	(73)	(53)
Uncollectible reinsurance | Segment Reconciling Items
Prior accident year development [1]	(10)	(8)
Insurance, Other [Member] | Segment Reconciling Items
Prior accident year development [1]	26	22
Property, Liability and Casualty Insurance Product Line
Prior accident year development [1]	170	(320)
Prior accident year development before change in deferred gain	97	(417)
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member]
Increase (Decrease) in Deferred Revenue	$ 73	$ 97

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- Definition

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

+ References

No definition available.

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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.

+ References

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-Publisher FASB
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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