| **Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions** | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Assets**                                                                                                                                                                                                         |          |          |          |
| Cash                                                                                                                                                                                                               | $ 475         | $ 536         |          |
| Total assets                                                                                                                                                                                                       | 60,927        | 66,639        |          |
| **Liabilities**                                                                                                                                                                                                    |          |          |          |
| Short term debt                                                                                                                                                                                                    | 243           | 0             |          |
| Long term debt                                                                                                                                                                                                     | 2,538         | 2,779         |          |
| Other liabilities                                                                                                                                                                                                  | 2,983         | 3,377         |          |
| Total liabilities                                                                                                                                                                                                  | 52,102        | 53,830        |          |
| **Stockholders' Equity**                                                                                                                                                                                           |          |          |          |
| Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,895,902 and 271,363,999 shares outstanding)                                                                           | 683           | 683           |          |
| Additional paid-in capital                                                                                                                                                                                         | 2,220         | 2,215         |          |
| Retained earnings                                                                                                                                                                                                  | 9,572         | 9,663         |          |
| Accumulated other comprehensive (loss) income                                                                                                                                                                      | (3,557)       | 320           |          |
| Treasury stock (2,144,341 and 1,676,244 shares), at cost                                                                                                                                                           | (93)          | (72)          |          |
| Total stockholders’ equity                                                                                                                                                                                   | 8,825         | 12,809        | $ 12,707      |
| Total liabilities and stockholders' equity                                                                                                                                                                         | $ 60,927      | $ 66,639      |          |
| **Balance Sheet Parenthetical**                                                                                                                                                                                    |          |          |          |
| Common stock, par value (in usd per share)                                                                                                                                                                         | $ 2.50        | $ 2.50        |          |
| Common stock, shares authorized (in shares                                                                                                                                                                         | 500,000,000   | 500,000,000   |          |
| Common stock, shares issued (in shares)                                                                                                                                                                            | 273,040,243   | 273,040,243   |          |
| Common stock, shares outstanding (in shares)                                                                                                                                                                       | 270,895,902   | 271,363,999   |          |
| Treasury stock, shares (in shares)                                                                                                                                                                                 | 2,144,341     | 1,676,244     |          |
| Parent Company                                                                                                                                                                                                     |          |          |          |
| **Assets**                                                                                                                                                                                                         |          |          |          |
| Investment in subsidiaries                                                                                                                                                                                         | $ 11,063      | $ 14,937      |          |
| Cash                                                                                                                                                                                                               | 2             | 1             |          |
| Short term investments                                                                                                                                                                                             | 578           | 685           |          |
| Amounts due from affiliates                                                                                                                                                                                        | 4             | 3             |          |
| Total assets                                                                                                                                                                                                       | 11,647        | 15,626        |          |
| **Liabilities**                                                                                                                                                                                                    |          |          |          |
| Short term debt                                                                                                                                                                                                    | 243           | 0             |          |
| Long term debt                                                                                                                                                                                                     | 2,538         | 2,779         |          |
| Other liabilities                                                                                                                                                                                                  | 41            | 38            |          |
| Total liabilities                                                                                                                                                                                                  | 2,822         | 2,817         |          |
| **Stockholders' Equity**                                                                                                                                                                                           |          |          |          |
| Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,895,902 and 271,363,999 shares outstanding)                                                                           | 683           | 683           |          |
| Additional paid-in capital                                                                                                                                                                                         | 2,220         | 2,215         |          |
| Retained earnings                                                                                                                                                                                                  | 9,572         | 9,663         |          |
| Accumulated other comprehensive (loss) income                                                                                                                                                                      | (3,557)       | 320           |          |
| Treasury stock (2,144,341 and 1,676,244 shares), at cost                                                                                                                                                           | (93)          | (72)          |          |
| Total stockholders’ equity                                                                                                                                                                                   | 8,825         | 12,809        |          |
| Total liabilities and stockholders' equity                                                                                                                                                                         | $ 11,647      | $ 15,626      |          |

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The entity's equity interest in its subsidiaries.
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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Face amount or stated value per share of common stock.
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.
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| - Definition
Amount of liabilities classified as other.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.
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| - Definition
Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.
+ References
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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.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.
+ References
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