| **Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions** | Total    | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative effect adjustments from changes in accounting guidance, net of tax | Retained Earnings Balance, beginning of year, as adjusted | Accumulated Other Comprehensive Income (Loss) | Treasury Stock |
|-----------------------------------------------------------------------------|----------|--------------|----------------------------|-------------------|-------------------------------------------------------------------------------------------------|-----------------------------------------------------------|-----------------------------------------------|----------------|
| Total stockholder's equity at beginning of period at Dec. 31, 2018          |     | $ 683        | $ 2,192                    | $ 9,277           |                                                                                            | $ 9,277                                                   | $ (878)                                       | $ (57)         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                                                                            |                                                      |                                          |           |
| Stock-based compensation                                                    |     |         | 11                         |              |                                                                                            |                                                      |                                          | 10             |
| Dividends to common stockholders ($2.27, $3.48, and $3.40 per share)        |     |         |                       | (929)             |                                                                                            |                                                      |                                          |           |
| Net income                                                                  | $ 1,000  |         |                       | 1,000             |                                                                                            |                                                      |                                          |           |
| Other comprehensive (loss) income                                           | 929      |         |                       |              |                                                                                            |                                                      | 929                                           |           |
| Purchase of treasury stock                                                  |     |         |                       |              |                                                                                            |                                                      |                                          | (23)           |
| Total stockholder's equity at end of period at Dec. 31, 2019                | 12,215   | 683          | 2,203                      | 9,348             | $ (5)                                                                                           | 9,343                                                     | 51                                            | (70)           |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                                                                            |                                                      |                                          |           |
| Stock-based compensation                                                    |     |         | 8                          |              |                                                                                            |                                                      |                                          | 17             |
| Dividends to common stockholders ($2.27, $3.48, and $3.40 per share)        |     |         |                       | (952)             |                                                                                            |                                                      |                                          |           |
| Net income                                                                  | 690      |         |                       | 690               |                                                                                            |                                                      |                                          |           |
| Other comprehensive (loss) income                                           | 752      |         |                       |              |                                                                                            |                                                      | 752                                           |           |
| Purchase of treasury stock                                                  |     |         |                       |              |                                                                                            |                                                      |                                          | (18)           |
| Total stockholder's equity at end of period at Dec. 31, 2020                | 12,707   | 683          | 2,211                      | 9,081             |                                                                                            | $ 9,081                                                   | 803                                           | (71)           |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |              |                                                                                            |                                                      |                                          |           |
| Stock-based compensation                                                    |     |         | 4                          |              |                                                                                            |                                                      |                                          | 17             |
| Dividends to common stockholders ($2.27, $3.48, and $3.40 per share)        |     |         |                       | (620)             |                                                                                            |                                                      |                                          |           |
| Net income                                                                  | 1,202    |         |                       | 1,202             |                                                                                            |                                                      |                                          |           |
| Other comprehensive (loss) income                                           | (483)    |         |                       |              |                                                                                            |                                                      | (483)                                         |           |
| Purchase of treasury stock                                                  |     |         |                       |              |                                                                                            |                                                      |                                          | (18)           |
| Total stockholder's equity at end of period at Dec. 31, 2021                | $ 12,809 | $ 683        | $ 2,215                    | $ 9,663           |                                                                                            |                                                      | $ 320                                         | $ (72)         |

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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
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
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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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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+ Details**Name:**us-gaap_TreasuryStockValueAcquiredCostMethod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |