Summary of Significant Accounting Policies Inventory (Tables)

12 Months Ended

Dec. 31, 2024

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, 2024		Dec. 31, 2023
Inventories
Materials and supplies	$	13	$	11
Fuel	10		10
Natural gas	5		8
Total inventories	$	28	$	29