| **Summary of Significant Accounting Policies (Effects of Adoption ASU 2018-12, Cash Flows) (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                                         | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 239          | $ (42)          | $ 190 | $ 295 | $ 1,205 | $ 682 | [1] | $ 1,184 | [1] |
| Deferred income tax expense (benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |   |   | 2 | (89) | [1] | 43 | [1] |
| Insurance reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   | $ 1,667 | 2,058 | [1] | 2,485 | [1] |
| Prior to Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |   |   |   |   |  |   |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 248            | 128             | 205 | 313 |   | 894 |  | 1,202 |  |
| Deferred income tax expense (benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |   |   |   | (34) |  | 47 |  |
| Insurance reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   | 1,791 |  | 2,463 |  |
| Effect of Adoption                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   |   |  |   |  |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |   |   |   |   |  |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ (9)          | $ (170)         | $ (15) | $ (18) |   | (212) |  | (18) |  |
| Deferred income tax expense (benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |   |   |   | (55) |  | (4) |  |
| Insurance reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |   |   |   | $ 267 |  | $ 22 |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [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 of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The increase (decrease) in insurance liability balances during the period.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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