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Summary of Significant Accounting Policies Inventory (Tables)
 12 Months Ended
Dec. 31, 2022
Balance Sheet Related Disclosure - Inventory [Abstract]  
Public Utilities, Inventory Inventory — Inventory is recorded at the lower of average cost or net realizable value and consisted of the following:
(Millions of Dollars)Dec. 31, 2022Dec. 31, 2021
Inventories
Materials and supplies$8 $8 
Fuel11 9 
Natural gas20 10 
Total inventories$39 $27