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Commitments and Contingencies - Additional Information (Details) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 plaintiff | Feb. 28, 2011 plaintiff | Jun. 30, 2018 USD ($) | Dec. 31, 2016 USD ($)
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum adverse loss development to be ceded under agreement |  |  |  | $ 1,500
Reinsurance premium |  |  |  | 650
Asbestos |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  | $ 1,100 |
Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  | 223 |
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts |  |  |  | $ 1,700
Adverse development from comprehensive annual review |  |  | 285 |
Asbestos and Environmental | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Adverse development from comprehensive annual review |  |  | $ 1,200 |
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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