Indebtedness: (Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total long-term debt	$ 48,667	$ 45,558
Less current portion of long-term debt	3,533	3,392
Long-term debt	45,134	42,166
Finance leases	$ 84	67
US Dollar Notes
Debt Instrument [Line Items]
Average interest rate	4.623%
Total long-term debt	$ 37,430	35,297
Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Average interest rate	2.162%
Total long-term debt	$ 7,942	7,082
Foreign Currency Obligations | Euro Bank Loan
Debt Instrument [Line Items]
Average interest rate	2.553%
Total long-term debt	$ 2,944	2,610
Foreign Currency Obligations | Swedish Krona Notes
Debt Instrument [Line Items]
Average interest rate	2.016%
Total long-term debt	$ 267	218
Foreign Currency Obligations | Other
Debt Instrument [Line Items]
Average interest rate	4.05%
Total long-term debt	$ 84	$ 351
Minimum | US Dollar Notes
Debt Instrument [Line Items]
Interest rate, stated rate	0.875%
Minimum | Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Interest rate, stated rate	0.125%
Minimum | Foreign Currency Obligations | Swedish Krona Notes
Debt Instrument [Line Items]
Interest rate, stated rate	1.395%
Maximum | US Dollar Notes
Debt Instrument [Line Items]
Interest rate, stated rate	6.375%
Maximum | Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Interest rate, stated rate	3.75%
Maximum | Foreign Currency Obligations | Swedish Krona Notes
Debt Instrument [Line Items]
Interest rate, stated rate	2.71%