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Selected Balance Sheet Data (Tables)
 6 Months Ended
Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Millions of Dollars)
 
June 30, 2018
 
Dec. 31, 2017
Accounts receivable, net
 
 
 
 
Accounts receivable
 
$
856

 
$
849

Less allowance for bad debts
 
(48
)
 
(52
)
 
 
$
808

 
$
797
Inventories
(Millions of Dollars)
 
June 30, 2018
 
Dec. 31, 2017
Inventories
 
 
 
 
Materials and supplies
 
$
312

 
$
311

Fuel
 
147

 
186

Natural gas
 
52

 
113

 
 
$
511

 
$
610
Property, Plant and Equipment, Net
(Millions of Dollars)
 
June 30, 2018
 
Dec. 31, 2017
Property, plant and equipment, net
 
 
 
 
Electric plant
 
$
39,745

 
$
39,016

Natural gas plant
 
5,955

 
5,800

Common and other property
 
2,045

 
2,013

Plant to be retired (a)
 
10

 
11

Construction work in progress
 
2,658

 
2,087

Total property, plant and equipment
 
50,413

 
48,927

Less accumulated depreciation
 
(15,479
)
 
(15,000
)
Nuclear fuel
 
2,712

 
2,697

Less accumulated amortization
 
(2,357
)
 
(2,295
)
 
 
$
35,289

 
$
34,329


(a) 
In the third quarter of 2017, PSCo early retired Valmont Unit 5 and converted Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025. Amounts are presented net of accumulated depreciation.