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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
	Jun. 30, 2021	Jun. 30, 2020
Segment Reconciling Items
Increase (Decrease) in Deferred Revenue	$ 45	$ 83
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]	(83)	(38)
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items
Prior accident year development [1]	18	18
General Liability [Member] | Segment Reconciling Items
Prior accident year development [1]	307	114
Marine | Segment Reconciling Items
Prior accident year development [1]	1	1
Package Business [Member] | Segment Reconciling Items
Prior accident year development [1]	(46)	(6)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items
Prior accident year development [1]	(20)	(2)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	1	0
Professional Liability Insurance [Member] | Segment Reconciling Items
Prior accident year development [1]	(7)	5
Surety Product Line [Member] | Segment Reconciling Items
Prior accident year development [1]	(14)	(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]	0	27
Automobiles [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	(43)	(21)
Uncollectible reinsurance | Segment Reconciling Items
Prior accident year development [1]	(10)	(2)
Insurance, Other [Member] | Segment Reconciling Items
Prior accident year development [1]	29	6
Property, Liability and Casualty Insurance Product Line
Prior accident year development [1]	80	(245)
Prior accident year development before change in deferred gain	$ 35	$ (328)

X

- Definition

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

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

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