Selected Balance Sheet Data (Tables)

9 Months Ended

Sep. 30, 2023

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Millions of Dollars)	Sept. 30, 2023		Dec. 31, 2022
Accounts receivable, net
Accounts receivable	$	554	$	580
Less allowance for bad debts	(46)		(46)
Accounts receivable, net	$	508	$	534

Inventories

(Millions of Dollars)	Sept. 30, 2023		Dec. 31, 2022
Inventories
Materials and supplies	$	214	$	200
Fuel	92		103
Natural gas	30		81
Total inventories	$	336	$	384

Property, plant and equipment, net

(Millions of Dollars)	Sept. 30, 2023		Dec. 31, 2022
Property, plant and equipment, net
Electric plant	$	20,716	$	20,114
Natural gas plant	2,216		2,100
Common and other property	1,298		1,156
Plant to be retired (a)	616		646
Construction work in progress	1,133		907
Total property, plant and equipment	25,979		24,923
Less accumulated depreciation	(7,986)		(7,734)
Nuclear fuel	3,282		3,183
Less accumulated amortization	(2,975)		(2,894)
Property, plant and equipment, net	$	18,300	$	17,478

(a)Amounts include regulator-approved retirements of Sherco Units 1, 2, 3 and A.S. King. Amounts are reported net of accumulated depreciation.