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Selected Balance Sheet Data
 9 Months Ended
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]  
Selected Balance Sheet Data
(Millions of Dollars)Sept. 30, 2021Dec. 31, 2020
Accounts receivable, net
Accounts receivable$1,119 $995 
Less allowance for bad debts(97)(79)
Accounts receivable, net$1,022 $916 

(Millions of Dollars)Sept. 30, 2021Dec. 31, 2020
Inventories
Materials and supplies$283 $275 
Fuel155 176 
Natural gas149 84 
Total inventories$587 $535 

(Millions of Dollars)Sept. 30, 2021Dec. 31, 2020
Property, plant and equipment, net
Electric plant$49,293 $47,104 
Natural gas plant7,443 7,135 
Common and other property2,519 2,503 
Plant to be retired (a)
603 677 
Construction work in progress2,263 1,877 
Total property, plant and equipment62,121 59,296 
Less accumulated depreciation(17,711)(16,657)
Nuclear fuel3,065 2,970 
Less accumulated amortization(2,745)(2,659)
Property, plant and equipment, net$44,730 $42,950 
(a)Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1 for PSCo and Sherco Units 1 and 2 for NSP-Minnesota. Also includes SPS’ expected retirement of Tolk and conversion of Harrington to natural gas, and PSCo’s planned retirement of jointly owned Craig Unit 2.