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Financial Instruments: (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Carrying amounts of debt hedged	$ 2,941
Cumulative fair value gain (loss) of hedged liability	42
Gross unrecognized holding losses on other investments	7
Foreign exchange contracts
Derivative [Line Items]
Derivative gains to be reclassified to earnings	260
Long-Term Debt And Lease Obligation, Current
Derivative [Line Items]
Carrying amounts of debt hedged	$ 346
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Less current portion of long-term debt
Long-Term Debt And Lease Obligation
Derivative [Line Items]
Carrying amounts of debt hedged	$ 2,595
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt (Note 8)
Level 1
Derivative [Line Items]
Other investments	$ 125
Net Investment Hedging \| Foreign Debt
Derivative [Line Items]
Gain of currency translation	$ 99	$ 48	$ 521