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FAIR VALUE (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Measurement Levels for all Assets and Liabilities | The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value as of the periods indicated:
|  |  | Fair Value Measurement Using:
(Dollars in millions) | December 31, 2023 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Fixed maturities - available for sale |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |
U.S. government agencies and corporations | $ | 996 |  |  | $ | — |  |  | $ | 996 |  |  | $ | — |
Obligations of U.S. States and political subdivisions | 128 |  |  | — |  |  | 128 |  |  | — |
Corporate securities | 7,353 |  |  | — |  |  | 6,681 |  |  | 672 |
Asset-backed securities | 5,618 |  |  | — |  |  | 4,313 |  |  | 1,305 |
Mortgage-backed securities |  |  |  |  |  |  |
Commercial | 1,000 |  |  | — |  |  | 1,000 |  |  | — |
Agency residential | 4,695 |  |  | — |  |  | 4,695 |  |  | — |
Non-agency residential | 443 |  |  | — |  |  | 443 |  |  | — |
Foreign government securities | 1,967 |  |  | — |  |  | 1,967 |  |  | — |
Foreign corporate securities | 5,540 |  |  | — |  |  | 5,524 |  |  | 16 |
Total fixed maturities - available for sale | 27,740 |  |  | — |  |  | 25,747 |  |  | 1,993 |
Equity securities, fair value | 188 |  |  | 70 |  |  | 118 |  |  | — |
(Some amounts may not reconcile due to rounding.) The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value as of the periods indicated:
|  |  | Fair Value Measurement Using:
(Dollars in millions) | December 31, 2022 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Fixed maturities - available for sale |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |
U.S. government agencies and corporations | $ | 1,257 |  |  | $ | — |  |  | $ | 1,257 |  |  | $ | — |
Obligations of U.S. States and political subdivisions | 413 |  |  | — |  |  | 413 |  |  | — |
Corporate securities | 6,469 |  |  | — |  |  | 5,754 |  |  | 715 |
Asset-backed securities | 4,063 |  |  | — |  |  | 3,069 |  |  | 994 |
Mortgage-backed securities |  |  |  |  |  |  |
Commercial | 919 |  |  | — |  |  | 919 |  |  | — |
Agency residential | 3,099 |  |  | — |  |  | 3,099 |  |  | — |
Non-agency residential | 4 |  |  | — |  |  | 4 |  |  | — |
Foreign government securities | 1,415 |  |  | — |  |  | 1,415 |  |  | — |
Foreign corporate securities | 4,596 |  |  | — |  |  | 4,579 |  |  | 16 |
Total fixed maturities - available for sale | 22,236 |  |  | — |  |  | 20,511 |  |  | 1,725 |
Equity securities, fair value | 281 |  |  | 132 |  |  | 150 |  |  | — |
(Some amounts may not reconcile due to rounding.)
Schedule of Activity under Level 3, Fair Value Measurements using Significant Unobservable Inputs by Asset Type | The following table presents the activity under Level 3, fair value measurements using significant unobservable inputs for fixed maturities - available for sale, for the periods indicated:
| Total Fixed Maturities - Available for Sale
| December 31, 2023 |  | December 31, 2022
(Dollars in millions) | Corporate Securities |  | Asset-Backed Securities |  | CMBS |  | Foreign Corporate |  | Total |  | Corporate Securities |  | Asset-Backed Securities |  | CMBS |  | Foreign Corporate |  | Total
Beginning balance fixed maturities | $ | 715 |  |  | $ | 994 |  |  | $ | — |  |  | $ | 16 |  |  | $ | 1,725 |  |  | $ | 801 |  |  | $ | 1,251 |  |  | $ | — |  |  | $ | 16 |  |  | $ | 2,068 |
Total gains or (losses) (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings (or changes in net assets) | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | (10) |  |  | — |  |  | — |  |  | — |  |  | (10) |
Included in other comprehensive income (loss) | (2) |  |  | 6 |  |  | — |  |  | — |  |  | 4 |  |  | 3 |  |  | (35) |  |  | — |  |  | (4) |  |  | (36) |
Purchases, issuances and settlements | (45) |  |  | 305 |  |  | — |  |  | — |  |  | 260 |  |  | (45) |  |  | 513 |  |  | 6 |  |  | 8 |  |  | 481 |
Transfers in and/or (out) of Level 3 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (35) |  |  | (735) |  |  | (6) |  |  | (4) |  |  | (779) |
Ending balance | $ | 672 |  |  | $ | 1,305 |  |  | $ | — |  |  | $ | 16 |  |  | $ | 1,993 |  |  | $ | 715 |  |  | $ | 994 |  |  | $ | — |  |  | $ | 16 |  |  | $ | 1,725 |
The amount of total gains or losses for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
included in earnings (or changes in net assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
attributable to the change in unrealized gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
or losses relating to assets still held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
at the reporting date | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | (23) |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | (15) |
(Some amounts may not reconcile due to rounding.)

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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