| **Summary of Significant Accounting Policies (Effects of Adoption of ASU 2018-12, Operations) (Details) - USD ($) $ / shares in Units, $ in Millions**                                                                                                                                                                                                                                                                                                                                 | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
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| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Insurance claims and policyholders' benefits                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   | $ 7,068 | $ 6,653 | [1] | $ 6,371 | [1] |
| Income (loss) before income tax                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |   |   | 1,518 | 814 | [1] | 1,462 | [1] |
| Income tax (expense) benefit                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   | 313 | 132 | [1] | 278 | [1] |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 239          | $ (42)          | $ 190 | $ 295 | $ 1,205 | $ 682 | [1] | $ 1,184 | [1] |
| Basic earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   | $ 4.44 | $ 2.51 | [1] | $ 4.36 | [1] |
| Diluted earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ 0.87         | $ (0.15)        | $ 0.69 | $ 1.08 | $ 4.43 | $ 2.51 | [1] | $ 4.34 | [1] |
| Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact                                                                                                                                                                                                                                                                                                                                                                                  |           |            |   |   | $ (88) | $ (214) |  | $ (8) |  |
| Prior to Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |   |   |   |   |  |   |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Insurance claims and policyholders' benefits                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   |   | 6,386 |  | 6,349 |  |
| Income (loss) before income tax                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |   |   |   | 1,081 |  | 1,484 |  |
| Income tax (expense) benefit                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   |   | 187 |  | 282 |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 248          | $ 128           | $ 205 | $ 313 |   | $ 894 |  | $ 1,202 |  |
| Basic earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   | $ 3.29 |  | $ 4.42 |  |
| Diluted earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ 0.91         | $ 0.47          | $ 0.75 | $ 1.15 |   | $ 3.28 |  | $ 4.41 |  |
| Effect of Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   |   |  |   |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Insurance claims and policyholders' benefits                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   |   | $ 267 |  | $ 22 |  |
| Income (loss) before income tax                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |   |   |   | (267) |  | (22) |  |
| Income tax (expense) benefit                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |   |   |   | (55) |  | (4) |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ (9)          | $ (170)         | $ (15) | $ (18) |   | $ (212) |  | $ (18) |  |
| Basic earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   | $ (0.78) |  | $ (0.06) |  |
| Diluted earnings (loss) per share (in usd per share)                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ (0.04)       | $ (0.62)        | $ (0.06) | $ (0.07) |   | $ (0.77) |  | $ (0.07) |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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