| **Condensed Consolidated Balance Sheets - USD ($) $ in Millions**                                                                                  | Sep. 30, 2020 | Dec. 31, 2019 |
|----------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Investments**                                                                                                                                    |          |          |
| Fixed maturities, at fair value (amortized cost: 2020—$11,273; 2019—$11,108)                                                           | $ 12,157      | $ 11,698      |
| Equity securities, at fair value (cost: 2020—$3,898; 2019—$3,581)                                                                      | 7,867         | 7,752         |
| Other invested assets                                                                                                                              | 275           | 296           |
| Total investments                                                                                                                                  | 20,299        | 19,746        |
| Cash and cash equivalents                                                                                                                          | 914           | 767           |
| Investment income receivable                                                                                                                       | 131           | 133           |
| Finance receivable                                                                                                                                 | 86            | 77            |
| Premiums receivable                                                                                                                                | 1,925         | 1,777         |
| Reinsurance Recoverable                                                                                                                            | 533           | 610           |
| Prepaid reinsurance premiums                                                                                                                       | 73            | 54            |
| Deferred policy acquisition costs                                                                                                                  | 817           | 774           |
| Land, building and equipment, net, for company use (accumulated depreciation: 2020—$283; 2019—$276)                                    | 211           | 207           |
| Other assets                                                                                                                                       | 452           | 381           |
| Separate accounts                                                                                                                                  | 929           | 882           |
| Assets                                                                                                                                             | 26,370        | 25,408        |
| **Insurance reserves**                                                                                                                             |          |          |
| Loss and loss expense reserves                                                                                                                     | 6,747         | 6,147         |
| Life policy and investment contract reserves                                                                                                       | 2,900         | 2,835         |
| Unearned premiums                                                                                                                                  | 3,024         | 2,788         |
| Other liabilities                                                                                                                                  | 981           | 928           |
| Deferred income tax                                                                                                                                | 1,077         | 1,079         |
| Note payable                                                                                                                                       | 123           | 39            |
| Long-term debt and lease obligations                                                                                                               | 844           | 846           |
| Separate accounts                                                                                                                                  | 929           | 882           |
| Total liabilities                                                                                                                                  | 16,625        | 15,544        |
| Commitments and contingent liabilities (Note 12)                                                                                                   |               |               |
| **Shareholders' Equity**                                                                                                                           |          |          |
| Common stock, par value—$2 per share; (authorized: 2020 and 2019—500 million shares; issued: 2020 and 2019—198.3 million shares) | 397           | 397           |
| Paid-in capital                                                                                                                                    | 1,318         | 1,306         |
| Retained earnings                                                                                                                                  | 9,132         | 9,257         |
| Accumulated other comprehensive income                                                                                                             | 686           | 448           |
| Treasury stock at cost (2020—37.5 million shares and 2019—35.4 million shares)                                                         | (1,788)       | (1,544)       |
| Total shareholders' equity                                                                                                                         | 9,745         | 9,864         |
| Total liabilities and shareholders' equity                                                                                                         | $ 26,370      | $ 25,408      |

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.
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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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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount of equity securities categorized neither as held-to-maturity nor as trading.
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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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.
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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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Amount of deferred tax liability attributable to taxable temporary differences.
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Amount of deferred policy acquisition cost capitalized on contract remaining in force.
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Sum of the carrying amounts as of the balance sheet date of all investments.
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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.
+ References
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| - Definition
The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date.
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| - References
No definition available.
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| - Definition
Amount of accrued obligation to policyholders that relates to insured events under long-term life insurance contracts.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
+ References
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| - Definition
Amount of long-term debt and lease obligation, classified as noncurrent.
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| - Definition
Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.
+ References
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| - Definition
Amount of assets classified as other.
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| - Definition
Amount of investments classified as other.
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| - Definition
Amount of liabilities classified as other.
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| - Definition
The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.
+ References
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| - Definition
The unexpired portion of premiums ceded on policies in force as of the balance sheet date.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset at fair value held for benefit of separate account policyholder.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.
+ 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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| - References
No definition available.
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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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| - Definition
Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910
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