| **Summary of Significant Accounting Policies (Effects of Adoption of ASU 2018-12, Stockholders' Equity) (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                            | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | [1]      | Dec. 31, 2020 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|----------|---------------|
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 9,893       | $ 8,548       | [1]           | $ 11,105 |          |  |
| Accumulated other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                                          |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             | (2,672)       | (3,598)       | [1]           | (1,360)  | $ (1,537)     | [1] |
| Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 9,755       | 9,336         | [1]           | 9,639    | 9,075         | [1] |
| Prior to Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          | 8,825         |               |     |          |  |
| Prior to Adoption | Accumulated other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          | (3,557)       |               | 320      | 803           | [1] |
| Prior to Adoption | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                  |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          | $ 9,572       |               | $ 9,663  | 9,081         | [1] |
| De-recognition of shadow reserves | Accumulated other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | 2,601         |  |
| De-recognition of shadow reserves | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                  |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | 0             |  |
| Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate | Accumulated other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                         |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | (4,941)       |  |
| Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                     |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | 0             |  |
| Other adjustments | Accumulated other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                      |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | 0             |  |
| Other adjustments | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                  |          |          |               |     |          |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |          |          |               |     |          |  |
| Total stockholders' equity                                                                                                                                                                                                                                                                                                                                                                                                                                                             |          |          |               |     | $ (6)         |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [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
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
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