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Selected Balance Sheet Data (Tables)
 3 Months Ended
Mar. 31, 2020
Balance Sheet Related Disclosures [Abstract]  
Accounts receivable, net
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Accounts receivable, net
 
 
 
 
Accounts receivable
 
$
897

 
$
892

Less allowance for bad debts
 
(58
)
 
(55
)
Accounts receivable, net
 
$
839

 
$
837
Inventories
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Inventories
 
 
 
 
Materials and supplies
 
$
283

 
$
270

Fuel
 
170

 
191

Natural gas
 
35

 
83

Total inventories
 
$
488

 
$
544
Property, plant and equipment, net
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Property, plant and equipment, net
 
 
 
 
Electric plant
 
$
44,544

 
$
44,355

Natural gas plant
 
6,653

 
6,560

Common and other property
 
2,991

 
2,341

Plant to be retired (a)
 
217

 
259

CWIP
 
2,756

 
2,329

Total property, plant and equipment
 
57,161

 
55,844

Less accumulated depreciation
 
(16,730
)
 
(16,735
)
Nuclear fuel
 
2,913

 
2,909

Less accumulated amortization
 
(2,568
)
 
(2,535
)
Property, plant and equipment, net
 
$
40,776

 
$
39,483


(a) 
In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025. Amounts are presented net of accumulated depreciation.