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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reconciling Items | Catastrophe
Prior accident year development [1]	$ (3)	$ (16)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items
Prior accident year development [1]	(45)	(40)
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items
Prior accident year development [1]	9	9
General Liability [Member] | Segment Reconciling Items
Prior accident year development [1]	12	307
Marine | Segment Reconciling Items
Prior accident year development [1]	0	6
Package Business [Member] | Segment Reconciling Items
Prior accident year development [1]	(11)	(27)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items
Prior accident year development [1]	(15)	(13)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	0	(3)
Professional Liability Insurance [Member] | Segment Reconciling Items
Prior accident year development [1]	0	(1)
Surety Product Line [Member] | Segment Reconciling Items
Prior accident year development [1]	0	0
Assumed reinsurance | Segment Reconciling Items
Prior accident year development [1]	12	2
Automobiles [Member] | Commercial Lines | Segment Reconciling Items
Prior accident year development [1]	0	0
Automobiles [Member] | Personal Lines | Segment Reconciling Items
Prior accident year development [1]	(5)	(23)
Uncollectible reinsurance | Segment Reconciling Items
Prior accident year development [1]	0	(9)
Insurance, Other [Member] | Segment Reconciling Items
Prior accident year development [1]	10	31
Property, Liability and Casualty Insurance Product Line
Prior accident year development [1]	(36)	229
Prior accident year development before change in deferred gain	(36)	223
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member]
Increase (Decrease) in Deferred Revenue	$ 0	$ 6

X

- Definition

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

+ References

No definition available.

+ Details

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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)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

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