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Summary of Significant Accounting Policies Inventory (Tables)
 12 Months Ended
Dec. 31, 2025
Balance Sheet Related Disclosure - Inventory [Abstract]  
Schedule of Utility Inventory [Table Text Block]
Inventory — Inventory is recorded at the lower of average cost or net realizable value and consisted of the following:
(Millions of Dollars)Dec. 31, 2025Dec. 31, 2024
Inventories
Materials and supplies$74 $60 
Fuel10 11 
Total inventories$84 $71