Selected Balance Sheet Data

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$	422	$	425
Less allowance for bad debts	(37)		(33)
Accounts receivable, net	$	385	$	392

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Inventories
Materials and supplies	$	181	$	178
Fuel	66		90
Natural gas	6		27
Total inventories	$	253	$	295

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	19,647	$	18,948
Natural gas plant	1,720		1,707
Common and other property	969		955
Plant to be retired (a)	127		136
Construction work in progress	965		1,150
Total property, plant and equipment	23,428		22,896
Less accumulated depreciation	(8,106)		(7,898)
Nuclear fuel	3,047		2,970
Less accumulated amortization	(2,690)		(2,660)
Property, plant and equipment, net	$	15,679	$	15,308

(a)Includes regulator-approved retirements of Sherco Units 1 and 2.