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, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	330	$	289
Fuel	201		182
Natural gas	272		160
Total inventories	$	803	$	631