Indebtedness: (Debt Issuances) (Details) - Unsecured Debt $ in Millions	Sep. 30, 2026 USD ($)
US Dollar Notes Due April 2029
Debt Instrument [Line Items]
Face Value	$ 750
Interest Rate	4.125%
US Dollar Notes Due April 2036
Debt Instrument [Line Items]
Face Value	$ 750
Interest Rate	4.875%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details