Selected Balance Sheet Data (Tables)

9 Months Ended

Sep. 30, 2020

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Accounts receivable, net
Accounts receivable	$	965	$	892
Less allowance for bad debts	(66)		(55)
Accounts receivable, net	$	899	$	837

Inventories

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Inventories
Materials and supplies	$	275	$	270
Fuel	157		191
Natural gas	80		83
Total inventories	$	512	$	544

Property, plant and equipment, net

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Property, plant and equipment, net
Electric plant	$	46,531	$	44,355
Natural gas plant	6,899		6,560
Common and other property	2,401		2,341
Plant to be retired (a)	287		259
Construction work in progress	3,265		2,329
Total property, plant and equipment	59,383		55,844
Less accumulated depreciation	(17,456)		(16,735)
Nuclear fuel	2,930		2,909
Less accumulated amortization	(2,630)		(2,535)
Property, plant and equipment, net	$	42,227	$	39,483

(a)The CPUC has approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively, and PSCo’s Craig 1 in approximately 2025. Amounts are presented net of accumulated depreciation.