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Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended | 19 Months Ended | 48 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | $ 1,119 |  |  | $ 1,119 | $ 1,119 |
Premium tax offsets | 0 | $ 2 |  | 0 | 0 |
Fair value of derivative instrument in a net liability position | 86 |  |  | 86 | 86 |
Collateral already posted | 90 |  |  | 90 | 90 |
Additional collateral required | 2 |  |  | 2 | 2 |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | 83 | $ 89 |  |  |  |
Net asbestos reserves |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 702 |  |  | 702 | 702 |
Net environmental reserves |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 87 |  |  | 87 | 87 |
Asbestos and Environmental |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | $ 640 |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  | $ 1,700 |  |  |
Adverse development from comprehensive annual review |  |  |  | 220 | 860 |
Other liabilities | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability |  |  |  |  |  | $ 25
Insurance-related Assessments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund | 1.00% |  |  |  |  |
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund | 2.00% |  |  |  |  |
Limited partnerships and other alternative investments |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | $ 804 |  |  | 804 | 804 |
Private Placement Securities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | 79 |  |  | 79 | 79 |
Mortgage loans |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | 236 |  |  | 236 | 236 |
Cancelable mortgage loan [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | $ 149 |  |  | $ 149 | $ 149 |

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