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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	$ 17,009	$ 16,735
Equity Securities, FV-NI, Cost	3,964	3,953
Short-term investments, available-for-sale, amortized cost basis	100	298
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 354	$ 347
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 2	$ 2
Common Stock, Shares Authorized (in shares)	500.0	500.0
Common Stock, Shares, Issued (in shares)	198.3	198.3
Treasury Stock, Common, Shares (in shares)	42.0	41.9

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Amortized cost of short-term investments measured at fair value with change 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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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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Amortized cost, after allowance for credit loss, 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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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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

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