| **Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions** | Total    | Common equities | Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income | Treasury Stock |
|------------------------------------------------------------------------------------------------------------|----------|-----------------|-----------------|-------------------|----------------------------------------|----------------|
| Beginning Balance at Dec. 31, 2022                                                                         |     | $ 397           | $ 1,392         | $ 11,711          | $ (614)                                | $ (2,324)      |
| Share-based awards                                                                                         |     | 0               | (6)             |              |                                   | 7              |
| Share-based compensation                                                                                   |     |            | 12              |              |                                   |           |
| Other                                                                                                      |     |            | 0               |              |                                   |           |
| Net Income                                                                                                 | $ 225    |            |            | 225               |                                   |           |
| Dividends declared                                                                                         |     |            |            | (118)             |                                   |           |
| Other comprehensive income (loss)                                                                          | 87       |            |            |              | 87                                     |           |
| Shares acquired - share repurchase authorization                                                           |     |            |            |              |                                   | (25)           |
| Shares acquired - share-based compensation plans                                                           |     |            |            |              |                                   | (3)            |
| Ending Balance at Mar. 31, 2023                                                                            | 10,741   | $ 397           | 1,398           | 11,818            | (527)                                  | (2,345)        |
| Beginning Balance (in shares) at Dec. 31, 2022                                                             |     | 157,100         |            |              |                                   |           |
| Share-based awards (in shares)                                                                             |     | 300             |            |              |                                   |           |
| Shares acquired - share repurchase authorization (in shares)                                               |     | (200)           |            |              |                                   |           |
| Shares acquired during period, Employee Share-Based Compensation Plans, Shares                             |     | 0               |            |              |                                   |           |
| Ending Balance (in shares) at Mar. 31, 2023                                                                |     | 157,200         |            |              |                                   |           |
| Dividends declared per common share (in dollars per share)                                                 |     | $ 0.75          |            |              |                                   |           |
| Beginning Balance at Dec. 31, 2023                                                                         | 12,098   | $ 397           | 1,437           | 13,084            | (435)                                  | (2,385)        |
| Share-based awards                                                                                         |     | 0               | (6)             |              |                                   | 8              |
| Share-based compensation                                                                                   |     |            | 14              |              |                                   |           |
| Other                                                                                                      |     |            | 1               |              |                                   |           |
| Net Income                                                                                                 | 755      |            |            | 755               |                                   |           |
| Dividends declared                                                                                         |     |            |            | (127)             |                                   |           |
| Other comprehensive income (loss)                                                                          | (7)      |            |            |              | (7)                                    |           |
| Shares acquired - share repurchase authorization                                                           |     |            |            |              |                                   | (75)           |
| Shares acquired - share-based compensation plans                                                           |     |            |            |              |                                   | (7)            |
| Ending Balance at Mar. 31, 2024                                                                            | $ 12,654 | $ 397           | $ 1,446         | $ 13,712          | $ (442)                                | $ (2,459)      |
| Beginning Balance (in shares) at Dec. 31, 2023                                                             |     | 157,000         |            |              |                                   |           |
| Share-based awards (in shares)                                                                             |     | 300             |            |              |                                   |           |
| Shares acquired - share repurchase authorization (in shares)                                               |     | (700)           |            |              |                                   |           |
| Shares acquired during period, Employee Share-Based Compensation Plans, Shares                             |     | (100)           |            |              |                                   |           |
| Ending Balance (in shares) at Mar. 31, 2024                                                                |     | 156,500         |            |              |                                   |           |
| Dividends declared per common share (in dollars per share)                                                 |     | $ 0.81          |            |              |                                   |           |

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Number of share options (or share units) exercised during the current period.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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