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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 88,247	$ 77,126	$ 74,595
Short-term investments, amortized cost	1,515	615	757
Nonredeemable preferred stocks, cost	454	756	760
Common equities, cost	808	745	733
Premium receivable, allowance for credit loss	516	460	388
Property and equipment, accumulated depreciation	$ 1,398	$ 1,461	$ 1,590
Common shares, par value (USD per share)	$ 1.00	$ 1.00	$ 1.00
Common shares, authorized (shares)	900,000,000	900,000,000	900,000,000
Common shares, issued (shares)	798,000,000	798,000,000	798,000,000
Treasury shares (shares)	212,000,000	212,000,000	212,000,000

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Amortized cost of investments in long-term debt securities (fixed maturities) measured at fair value with changes in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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