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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Workers’ compensation
Prior accident years reserve development
Prior accident year development	$ (164)	$ (79)	$ (119)
Workers’ compensation discount accretion
Prior accident years reserve development
Prior accident year development	40	28	28
General liability
Prior accident years reserve development
Prior accident year development	52	11	65
Package business
Prior accident years reserve development
Prior accident year development	(26)	(25)	65
Professional liability
Prior accident years reserve development
Prior accident year development	(12)	1	(37)
Bond
Prior accident years reserve development
Prior accident year development	2	32	(8)
Net asbestos reserves
Prior accident years reserve development
Prior accident year development	0	0	197
Net environmental reserves
Prior accident years reserve development
Prior accident year development	0	0	71
Catastrophes
Prior accident years reserve development
Prior accident year development	(49)	(16)	(7)
Uncollectible reinsurance
Prior accident years reserve development
Prior accident year development	22	(15)	(30)
Other
Prior accident years reserve development
Prior accident year development	38	27	24
Property and Casualty, Commercial Insurance Product Line [Member] | Property
Prior accident years reserve development
Prior accident year development	(12)	(8)	1
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile liability
Prior accident years reserve development
Prior accident year development	(15)	17	57
Property and Casualty, Personal Insurance Product Line [Member] | Property
Prior accident years reserve development
Prior accident year development	(25)	(14)	(10)
Property and Casualty, Personal Insurance Product Line [Member] | Automobile liability
Prior accident years reserve development
Prior accident year development	(18)	0	160
Property and Casualty Insurance Products
Prior accident years reserve development
Prior accident year development	(167)	$ (41)	$ 457
Scenario, Adjustment [Member] | Catastrophes
Prior accident years reserve development
Prior accident year development	$ 133

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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=99382578&loc=d3e14764-158437

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