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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, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Workers’ compensation
Product Information [Line Items]
Prior accident year development	$ (50)	$ (73)
Workers’ compensation discount accretion
Product Information [Line Items]
Prior accident year development	17	20
General liability
Product Information [Line Items]
Prior accident year development	43	28
Marine
Product Information [Line Items]
Prior accident year development	10	0
Package business
Product Information [Line Items]
Prior accident year development	(9)	(7)
Professional liability
Product Information [Line Items]
Prior accident year development	33	8
Bond
Product Information [Line Items]
Prior accident year development	0	0
Assumed Reinsurance
Product Information [Line Items]
Prior accident year development	3	0
Net asbestos reserves
Product Information [Line Items]
Prior accident year development	0	0
Net environmental reserves
Product Information [Line Items]
Prior accident year development	0	0
Catastrophes
Product Information [Line Items]
Prior accident year development	(22)	(34)
Uncollectible reinsurance
Product Information [Line Items]
Prior accident year development	0	11
Other reserve re-estimates, net
Product Information [Line Items]
Prior accident year development	16	3
Property and Casualty, Commercial Insurance Product Line [Member] | Property
Product Information [Line Items]
Prior accident year development	(15)	(12)
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile
Product Information [Line Items]
Prior accident year development	2	(10)
Property and Casualty, Personal Insurance Product Line [Member] | Property
Product Information [Line Items]
Prior accident year development	1	(13)
Property and Casualty, Personal Insurance Product Line [Member] | Automobile
Product Information [Line Items]
Prior accident year development	(5)	0
Property, Liability and Casualty Insurance Product Line
Product Information [Line Items]
Prior accident year development	24	(79)
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	5,125	3,772	$ 4,232	$ 3,957
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 22,623	19,859	$ 20,352	$ 19,818
Scenario, Adjustment [Member]
Product Information [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments		90
Scenario, Adjustment [Member] | Catastrophes
Product Information [Line Items]
Prior accident year development		123
Liability for Unpaid Claims and Claims Adjustment Expense, Net		$ 850

X

- Definition

Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.

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Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

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

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