| **Deferred Policy Acquisition Costs - ASU 2018-12 Transition Deferred Acquisition Costs Narrative (Details) - USD ($) $ in Millions** | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
|---------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **ASU 2018-12**                                                                                                                       |          |          |          |          |
| Deferred policy acquisition costs                                                                                                     | $ 1,093       | $ 1,013       | $ 916         | $ 838         |
| Accounting Standards Update 2018-12                                                                                                   |          |          |          |          |
| **ASU 2018-12**                                                                                                                       |          |          |          |          |
| Deferred policy acquisition costs                                                                                                     |          | 1,013         |          | 296           |
| Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Accounting Standards Update 2018-12                |          |          |          |          |
| **ASU 2018-12**                                                                                                                       |          |          |          |          |
| Deferred policy acquisition costs                                                                                                     |          | (1)           |          | 33            |
| Previously Reported | Accounting Standards Update 2018-12                                                                             |          |          |          |          |
| **ASU 2018-12**                                                                                                                       |          |          |          |          |
| Deferred policy acquisition costs                                                                                                     |          | $ 1,014       |          | $ 263         |

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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred policy acquisition cost capitalized on contract remaining in force.
+ References
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| - Definition
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