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Commitments and Contingencies - Additional Information (Details) - USD ($)		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Adverse development from comprehensive annual review		$ 661,000,000	$ 901,000,000	$ 388,000,000
Rental expense on operating leases		56,000,000	57,000,000	53,000,000
Sublease rental income		4,000,000	3,000,000	2,000,000
Outstanding commitments	$ 954,000,000	954,000,000
Minimum percentage of written premiums in state for assessment under guaranty funds		0.01
Maximum percentage of written premiums in state for assessment under guaranty funds		0.02
Guaranty liabilities	97,000,000	97,000,000	113,000,000
Fair value of derivative instrument in a net liability position	76,000,000	76,000,000
Collateral already posted	71,000,000	71,000,000
Additional collateral required	7,000,000	$ 7,000,000
Guarantor Obligations, Unlimited Exposure		The guarantees have no limitation as to maximum potential future payments.
Other Assets
Loss Contingencies [Line Items]
Premium tax offsets	2,000,000	$ 2,000,000	$ 6,000,000
Limited partnerships and other alternative investments
Loss Contingencies [Line Items]
Outstanding commitments	707,000,000	707,000,000
Private Placement Securities
Loss Contingencies [Line Items]
Outstanding commitments	163,000,000	163,000,000
Mortgage loans
Loss Contingencies [Line Items]
Outstanding commitments	84,000,000	84,000,000
Cancelable mortgage loan [Member]
Loss Contingencies [Line Items]
Outstanding commitments	48,000,000	48,000,000
Asbestos and Environmental
Loss Contingencies [Line Items]
Reinsurance premium				650,000,000
Maximum | Asbestos and Environmental
Loss Contingencies [Line Items]
Reinsurance Retention Policy, Excess Retention, Amount Reinsured		1,500,000,000
Asbestos
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	1,100,000,000	1,100,000,000
Environmental
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	203,000,000	203,000,000
Asbestos and Environmental
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	1,254,000,000	1,254,000,000
Reinsurance premium				$ 650,000,000
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	$ 977,000,000
Reinsurance Retention Policy, Amount Retained		1,700,000,000
Adverse development from comprehensive annual review		$ 523,000,000

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