| **Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                                                                                            | Total | Prior to Adoption | Effect of Adoption | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Prior to Adoption | Retained Earnings Effect of Adoption | Accumulated Other Comprehensive (Loss) | Accumulated Other Comprehensive (Loss) Prior to Adoption | Accumulated Other Comprehensive (Loss) Effect of Adoption | Treasury Stock |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------|-------------------|--------------------|--------------|----------------------------|-------------------|-------------------------------------|--------------------------------------|----------------------------------------|----------------------------------------------------------|-----------------------------------------------------------|----------------|
| Total stockholder's equity at beginning of period at Dec. 31, 2020                                                                                                                                                                                                                                                                                                                                                                                                                     | [1]   |              |                    |         |                       | $ 683             |                                     | $ 2,211                              |                                        | $ 9,075                                                  |                                                           | $ 9,081        | $ (6) | $ (1,537) |  | $ 803 | $ (2,340) | $ (71) |  |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                         |       |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   |   |  |
| Stock-based compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [1]   |              |                    |         |                       |              |                                     | 4                                    |                                        |                                                     |                                                           |           |   |   |  |   |   | 17 |  |
| Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)                                                                                                                                                                                                                                                                                                                                                                                                                   | [1]   |              |                    |         |                       |              |                                     |                                 |                                        | (620)                                                    |                                                           |           |   |   |  |   |   |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |       | $ 1,184           | [1]                | $ 1,202      | $ (18)                     |              |                                     |                                 |                                        | 1,184                                                    | [1]                                                       |           |   |   |  |   |   |   |  |
| Other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                                                      |       | 177               | [1]                | (483)        | 660                        |              |                                     |                                 |                                        |                                                     |                                                           |           |   | 177 | [1] |   |   |   |  |
| Purchase of treasury stock                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1]   |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   | (18) |  |
| Total stockholder's equity at end of period at Dec. 31, 2021                                                                                                                                                                                                                                                                                                                                                                                                                           | [1]   | 11,105            |                    |         |                       | 683               |                                     | 2,215                                |                                        | 9,639                                                    |                                                           | 9,663          | (24) | (1,360) |  | 320 | (1,680) | (72) |  |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                         |       |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   |   |  |
| Stock-based compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [1]   |              |                    |         |                       |              |                                     | 5                                    |                                        |                                                     |                                                           |           |   |   |  |   |   | 18 |  |
| Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)                                                                                                                                                                                                                                                                                                                                                                                                                   | [1]   |              |                    |         |                       |              |                                     |                                 |                                        | (985)                                                    |                                                           |           |   |   |  |   |   |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |       | 682               | [1]                | 894          | (212)                      |              |                                     |                                 |                                        | 682                                                      | [1]                                                       |           |   |   |  |   |   |   |  |
| Other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                                                      |       | (2,238)           | [1]                | (3,877)      | 1,639                      |              |                                     |                                 |                                        |                                                     |                                                           |           |   | (2,238) | [1] |   |   |   |  |
| Purchase of treasury stock                                                                                                                                                                                                                                                                                                                                                                                                                                                             | [1]   |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   | (39) |  |
| Total stockholder's equity at end of period at Dec. 31, 2022                                                                                                                                                                                                                                                                                                                                                                                                                           |       | 8,548             | [1]                | $ 8,825      | $ (277)                    | 683               | [1]                                 | 2,220                                | [1]                                    | 9,336                                                    | [1]                                                       | $ 9,572        | $ (236) | (3,598) | [1] | $ (3,557) | $ (41) | (93) | [1] |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                         |       |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   |   |  |
| Stock-based compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                               |       |              |                    |         |                       |              |                                     | 1                                    |                                        |                                                     |                                                           |           |   |   |  |   |   | 23 |  |
| Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)                                                                                                                                                                                                                                                                                                                                                                                                                   |       |              |                    |         |                       |              |                                     |                                 |                                        | (786)                                                    |                                                           |           |   |   |  |   |   |   |  |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |       | 1,205             |                    |         |                       |              |                                     |                                 |                                        | 1,205                                                    |                                                           |           |   |   |  |   |   |   |  |
| Other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                                                                                                                                      |       | 926               |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   | 926 |  |   |   |   |  |
| Purchase of treasury stock                                                                                                                                                                                                                                                                                                                                                                                                                                                             |       |              |                    |         |                       |              |                                     |                                 |                                        |                                                     |                                                           |           |   |   |  |   |   | (24) |  |
| Total stockholder's equity at end of period at Dec. 31, 2023                                                                                                                                                                                                                                                                                                                                                                                                                           |       | $ 9,893           |                    |         |                       | $ 683             |                                     | $ 2,221                              |                                        | $ 9,755                                                  |                                                           |           |   | $ (2,672) |  |   |   | $ (94) |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [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 increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
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