Benefit Plans: (Estimated Future Benefit Payments From Pension Plans) (Details) - Pension $ in Millions	Dec. 31, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2026	$ 496
2027	522
2028	531
2029	531
2030	562
2031 - 2035	$ 2,967

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