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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2016
Asbestos
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	$ 935
Environmental
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	139
Asbestos and Environmental
Loss Contingencies [Line Items]
Reinsurance premium		$ 650
Maximum adverse loss development to be ceded under agreement	977
Reinsurance Retention Policy, Amount Retained	1,700
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	523
Asbestos and Environmental | Maximum
Loss Contingencies [Line Items]
Maximum adverse loss development to be ceded under agreement	$ 1,500

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Cash payments made for reinsurance during the current period.

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-Publisher FASB
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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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