| **Summary of Significant Accounting Policies (Effects of Adoption of ASU 2018-12, Balance Sheet) (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                                   | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |          |  |   |
| Deferred income taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 1,016       | $ 1,251       | [1]           |          |  |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 64,711        | 61,000        | [1]           |          |  |   |
| Claim and claim adjustment expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 23,304        | 22,120        | [1]           | $ 21,268      |  |   |
| Future policy benefits                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 13,959        | 13,480        | [1]           | 18,010        |  | $ 19,132 |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 54,818        | 52,452        | [1]           |          |  |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 9,755         | 9,336         | [1]           |          |  |   |
| Accumulated other comprehensive loss                                                                                                                                                                                                                                                                                                                                                                                                                                                   | (2,672)       | (3,598)       | [1]           |          |  |   |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 9,893       | 8,548         | [1]           | $ 11,105      | [1] |   |
| Prior to Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |          |  |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |          |  |   |
| Deferred income taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |          | 1,178         |               |          |  |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          | 60,927        |               |          |  |   |
| Claim and claim adjustment expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                    |          | 25,099        |               |          |  |   |
| Future policy benefits                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |          | 10,151        |               |          |  | $ 13,318 |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          | 52,102        |               |          |  |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          | 9,572         |               |          |  |   |
| Accumulated other comprehensive loss                                                                                                                                                                                                                                                                                                                                                                                                                                                   |          | (3,557)       |               |          |  |   |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          | 8,825         |               |          |  |   |
| Effect of Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |          |          |               |          |  |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |          |  |   |
| Deferred income taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |          | 73            |               |          |  |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          | 73            |               |          |  |   |
| Claim and claim adjustment expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                    |          | (2,979)       |               |          |  |   |
| Future policy benefits                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |          | 3,329         |               |          |  |   |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          | 350           |               |          |  |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          | (236)         |               |          |  |   |
| Accumulated other comprehensive loss                                                                                                                                                                                                                                                                                                                                                                                                                                                   |          | (41)          |               |          |  |   |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          | $ (277)       |               |          |  |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [1]As of January 1, 2023, the Company adopted ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts (ASU 2018-12) using the modified retrospective method applied as of the transition date of January 1, 2021.  Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance.  See Note A to the Consolidated Financial Statements for additional information. |

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| - Definition
Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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