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Financial Instruments: (Fair Value of Other Investments) (Details) - Level 1 - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Argentina
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 189	$ 125
Indonesia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 27	$ 0

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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