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Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended | 72 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2022 | Jan. 01, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | $ 2,800 |  |  |  | $ 2,800 |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | 82 | $ 74 |  |  |  |
Premium tax offsets | 1 | 0 |  |  | 1 |
Fair value of derivative instrument in a net liability position | 8 |  |  |  | 8 |
Collateral already posted | 8 |  |  |  | 8 |
Asbestos and Environmental |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 390 |  |  |  | 390 |
Adverse development from comprehensive annual review |  |  | $ 220 |  | 1,244 |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 256 |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  |  | $ 1,700 |  |
Other liabilities | Retained Earnings |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability | $ 22 | $ 25 | $ 26 |  | 22 |
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 | $ 2,100 |  |  |  | 2,100 |
Private Placement Securities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | 335 |  |  |  | 335 |
Mortgage loans |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | 351 |  |  |  | 351 |
Cancelable mortgage loan [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Commitment | $ 66 |  |  |  | $ 66 |

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 15 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=99384745&loc=d3e23169-109297 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + 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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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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