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Commitments and Contingencies - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |
Adverse development from comprehensive annual review |  | $ 661,000,000 | $ 901,000,000 | $ 388,000,000
Rental expense on operating leases |  | 56,000,000 | 57,000,000 | 53,000,000
Sublease rental income |  | 4,000,000 | 3,000,000 | 2,000,000
Outstanding commitments | $ 954,000,000 | 954,000,000 |  |
Minimum percentage of written premiums in state for assessment under guaranty funds |  | 0.01 |  |
Maximum percentage of written premiums in state for assessment under guaranty funds |  | 0.02 |  |
Guaranty liabilities | 97,000,000 | 97,000,000 | 113,000,000 |
Fair value of derivative instrument in a net liability position | 76,000,000 | 76,000,000 |  |
Collateral already posted | 71,000,000 | 71,000,000 |  |
Additional collateral required | 7,000,000 | $ 7,000,000 |  |
Guarantor Obligations, Unlimited Exposure |  | The guarantees have no limitation as to maximum potential future payments. |  |
Other Assets |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Premium tax offsets | 2,000,000 | $ 2,000,000 | $ 6,000,000 |
Limited partnerships and other alternative investments |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Outstanding commitments | 707,000,000 | 707,000,000 |  |
Private Placement Securities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Outstanding commitments | 163,000,000 | 163,000,000 |  |
Mortgage loans |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Outstanding commitments | 84,000,000 | 84,000,000 |  |
Cancelable mortgage loan [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Outstanding commitments | 48,000,000 | 48,000,000 |  |
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance premium |  |  |  | 650,000,000
Maximum | Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 1,500,000,000 |  |
Asbestos |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 1,100,000,000 | 1,100,000,000 |  |
Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 203,000,000 | 203,000,000 |  |
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 1,254,000,000 | 1,254,000,000 |  |
Reinsurance premium |  |  |  | $ 650,000,000
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | $ 977,000,000 |  |  |
Reinsurance Retention Policy, Amount Retained |  | 1,700,000,000 |  |
Adverse development from comprehensive annual review |  | $ 523,000,000 |  |

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