| **Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions** | Total    | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Previously Reported | Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Other Comprehensive (Loss) Income | Accumulated Other Comprehensive (Loss) Income Previously Reported | Accumulated Other Comprehensive (Loss) Income Revision of Prior Period, Accounting Standards Update, Adjustment | Treasury Stock |
|-----------------------------------------------------------------------------|----------|--------------|----------------------------|-------------------|---------------------------------------|-------------------------------------------------------------------------------------|-----------------------------------------------|-------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------|----------------|
| Total stockholder's equity at beginning of period at Dec. 31, 2021          |     | $ 683        | $ 2,215                    | $ 9,639           | $ 9,663                               | $ (24)                                                                              | $ (1,360)                                     | $ 320                                                             | $ (1,680)                                                                                                       | $ (72)         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Stock-based compensation                                                    |     |         | 5                          |              |                                  |                                                                                |                                          |                                                              |                                                                                                            | 18             |
| Dividends to common stockholders ($3.76, $2.88, and $3.60 per share)        |     |         |                       | (985)             |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Net income                                                                  | $ 682    |         |                       | 682               |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Other comprehensive income (loss)                                           | (2,238)  |         |                       |              |                                  |                                                                                | (2,238)                                       |                                                              |                                                                                                            |           |
| Purchase of treasury stock                                                  |     |         |                       |              |                                  |                                                                                |                                          |                                                              |                                                                                                            | (39)           |
| Total stockholder's equity at end of period at Dec. 31, 2022                | 8,548    | 683          | 2,220                      | 9,336             | 9,572                                 | (236)                                                                               | (3,598)                                       | (3,557)                                                           | (41)                                                                                                            | (93)           |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Stock-based compensation                                                    |     |         | 1                          |              |                                  |                                                                                |                                          |                                                              |                                                                                                            | 23             |
| Dividends to common stockholders ($3.76, $2.88, and $3.60 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             | $ 9,755                               | $ 0                                                                                 | (2,672)                                       | $ (2,672)                                                         | $ 0                                                                                                             | (94)           |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Stock-based compensation                                                    |     |         | 8                          |              |                                  |                                                                                |                                          |                                                              |                                                                                                            | 20             |
| Dividends to common stockholders ($3.76, $2.88, and $3.60 per share)        |     |         |                       | (1,028)           |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Net income                                                                  | 959      |         |                       | 959               |                                  |                                                                                |                                          |                                                              |                                                                                                            |           |
| Other comprehensive income (loss)                                           | 681      |         |                       |              |                                  |                                                                                | 681                                           |                                                              |                                                                                                            |           |
| Purchase of treasury stock                                                  |     |         |                       |              |                                  |                                                                                |                                          |                                                              |                                                                                                            | (20)           |
| Total stockholder's equity at end of period at Dec. 31, 2024                | $ 10,513 | $ 683        | $ 2,229                    | $ 9,686           |                                  |                                                                                | $ (1,991)                                     |                                                              |                                                                                                            | $ (94)         |

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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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No definition available.
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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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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
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