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Commitments and Contingencies - Additional Information (Details) $ in Millions		1 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Mar. 31, 2016 plaintiff	Feb. 28, 2011 plaintiff	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)
Asbestos and Environmental
Loss Contingencies [Line Items]
Reinsurance premium					$ 650
Asbestos and Environmental | Maximum
Loss Contingencies [Line Items]
Maximum adverse loss development to be ceded under agreement				$ 1,500
Asbestos
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	$ 1,100			1,100
Environmental
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	214			214
Asbestos and Environmental
Loss Contingencies [Line Items]
Maximum adverse loss development to be ceded under agreement	$ 1,200
Reinsurance Retention Policy, Excess Retention, Amount Reinsured				285
Reinsurance Retention Policy, Amount Retained				$ 1,700
Pending Litigation [Member] | Mutual Funds Litigation [Member]
Loss Contingencies [Line Items]
Number of funds on which action has been brought | plaintiff		6	6
Settled Litigation [Member] | Mutual Funds Litigation [Member]
Loss Contingencies [Line Items]
Number of funds on which action has been brought | plaintiff		1

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Cash payments made for reinsurance during the current period.

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