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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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