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Commitments, Guarantees and Contingent Liabilities - Florida Hurricane Catastrophe Fund and California Earthquake Authority (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Florida Hurricane Catastrophe Fund |  |  |  |
Loss Contingencies |  |  |  |
Maximum emergency assessment as percent of premiums, first year |  |  | 6.00% |
Emergency assessment maximum percentage of premiums subsequent years |  |  | 10.00% |
Emergency assessment maximum percentage of premiums subsequent years, FL OIR |  |  | 0.00% |
Catastrophe fund, bonds issued |  | $ 2,000 |  |
California Earthquake Authority |  |  |  |
Loss Contingencies |  |  |  |
CEA capital balance | $ 5,430 |  |  |
Proceeds of revenue bonds | 685 |  |  |
CEA existing reinsurance layer | 7,510 |  |  |
Current estimated maximum CEA assessment | 1,660 |  |  |
CEA capital balance threshold | 350 |  |  |
Estimated maximum second CEA assessment | 54 |  |  |
CEA threshold earthquake losses | 15,330 |  |  |
CEA capital balance to be restored | 350 |  |  |
Projected aggregate claim paying capacity | $ 15,330 |  |  |
Share of the CEA (as a percent) |  |  |  | 11.20%
Maximum possible assessment |  |  | $ 191 |

X
- Definition The maximum estimated amount of an additional assessment triggered by specified loss and capital balance thresholds. + References No definition available. + Details
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- Definition The current maximum estimated amount of an assessment if the capital balance of a state insurance facility falls below a specified level. + References No definition available. + Details
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- Definition The amount of bonds issued subject to funding through emergency assessments on property and casualty premiums. + References No definition available. + Details
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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the first year that such bonding is required. + References No definition available. + Details
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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the second and subsequent years that such bonding is required. + References No definition available. + Details
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- Definition Emergency Assessment Maximum Percentage of Premiums Subsequent Years, FL OIR + References No definition available. + Details
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- Definition Represents the maximum possible assessment amount by a state insurance facility in which the entity participates. + References No definition available. + Details
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- Definition Represents the entity's share in a state insurance facility. + References No definition available. + Details
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- Definition Proceeds of Revenue Bonds + References No definition available. + Details
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- Definition Represents the projected aggregate claim paying capacity of a state insurance facility in which the entity participates. + References No definition available. + Details
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- Definition Represents the capital balance of a state insurance facility in which the entity participates. + References No definition available. + Details
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- Definition The capital balance of a state insurance facility, below which an assessment is triggered. + References No definition available. + Details
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- Definition Represents funding obtainable by a state insurance facility from an existing reinsurance layer in the event that losses cause a deficit. + References No definition available. + Details
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- Definition The amount of aggregate losses beyond which a second assessment is triggered, if the capital balance of the state insurance facility is at the same time below the threshold level. + References No definition available. + Details
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- Definition The capital balance level for a state insurance facility that may be restored through assessments. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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