Selected Balance Sheet Data (Tables)

3 Months Ended

Mar. 31, 2022

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of dollars)	March 31, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	94	$	79
Less allowance for bad debts	(9)		(8)
Accounts receivable, net	$	85	$	71

Inventories

(Millions of dollars)	March 31, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	8	$	8
Fuel	12		9
Natural gas	2		10
Total inventories	$	22	$	27

Property, Plant and Equipment, Net

(Millions of dollars)	March 31, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	3,408	$	3,348
Natural gas plant	428		423
Common and other property	243		233
Construction work in progress	124		134
Total property, plant and equipment	4,203		4,138
Less accumulated depreciation	(1,502)		(1,478)
Property, plant and equipment, net	$	2,701	$	2,660