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Selected Balance Sheet Data (Tables)
 9 Months Ended
Sep. 30, 2025
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Millions of Dollars)Sept. 30, 2025Dec. 31, 2024
Accounts receivable, net
Accounts receivable$223 $151 
Less allowance for bad debts(11)(12)
Accounts receivable, net$212 $139 
Inventories
(Millions of Dollars)Sept. 30, 2025Dec. 31, 2024
Inventories
Materials and supplies$68 $60 
Fuel10 11 
Total inventories$78 $71 
Property, Plant and Equipment, Net
3. Selected Balance Sheet Data
(Millions of Dollars)Sept. 30, 2025Dec. 31, 2024
Accounts receivable, net
Accounts receivable$223 $151 
Less allowance for bad debts(11)(12)
Accounts receivable, net$212 $139 
(Millions of Dollars)Sept. 30, 2025Dec. 31, 2024
Inventories
Materials and supplies$68 $60 
Fuel10 11 
Total inventories$78 $71 
(Millions of Dollars)Sept. 30, 2025Dec. 31, 2024
Property, plant and equipment, net
Electric plant$11,973 $11,443 
Plant to be retired (a)
164 182 
CWIP1,014 518 
Total property, plant and equipment13,151 12,143 
Less accumulated depreciation(3,030)(2,892)
Property, plant and equipment, net$10,121 $9,251 
(a)Amounts include Tolk Unit 1 and 2. Amounts are reported net of accumulated depreciation.