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Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended | 36 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | $ 1,258 |  | $ 1,258 |
Guaranty liabilities | 89 |  | 89 | $ 97
Fair value of derivative instrument in a net liability position | 81 |  | 81 |
Collateral already posted | 77 |  | 77 |
Additional collateral required | $ 5 |  | 5 |
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 |  | 2 | $ 2
Limited partnerships and other alternative investments |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | 852 |  | 852 |
Private Placement Securities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | 191 |  | 191 |
Mortgage loans |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | 215 |  | 215 |
Cancelable mortgage loan [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Other Commitment | 130 |  | 130 |
Asbestos |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 874 |  | 874 |
Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 120 |  | 120 |
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 1,147 |  | 1,147 |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 860 |  |  |
Reinsurance Retention Policy, Amount Retained |  | $ 1,700 |  |
Adverse development from comprehensive annual review | $ 640 |  | $ 640 |
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% |  |  |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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