Indebtedness: (Credit Facilities) (Details) € in Billions	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 USD ($)	Sep. 20, 2022 USD ($)	Jan. 28, 2022 USD ($)
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity		$ 6,300,000,000
Multi-year Revolving Credit Facility, Expiring February 10, 2026 | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity		2,000,000,000.0		$ 2,000,000,000.0
Multi-year Revolving Credit Facility, Expiring September 29, 2026 | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity		2,500,000,000	$ 2,500,000,000
Multi-year Revolving Credit Facility, Expiring January 29, 2028 | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity	€ 1.5	$ 1,800,000,000
Multi-year Revolving Credit Facility, Expiring February 10, 2027 | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity				$ 1,900,000,000
Multi-year Revolving Credit Facility, Expiring September 29, 2027 | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Committed credit facilities, maximum borrowing capacity			$ 2,300,000,000