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Selected Balance Sheet Data | 9 Months Ended
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Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract] |
Selected Balance Sheet Data |
(Millions of Dollars) |  | Sept. 30, 2023 |  | Dec. 31, 2022
Accounts receivable, net |  |  |  |
Accounts receivable |  | $ | 1,347 |  |  | $ | 1,495 |
Less allowance for bad debts |  | (127) |  |  | (122) |
Accounts receivable, net |  | $ | 1,220 |  |  | $ | 1,373 |
(Millions of Dollars) |  | Sept. 30, 2023 |  | Dec. 31, 2022
Inventories |  |  |  |
Materials and supplies |  | $ | 368 |  |  | $ | 330 |
Fuel |  | 193 |  |  | 201 |
Natural gas |  | 127 |  |  | 272 |
Total inventories |  | $ | 688 |  |  | $ | 803 |
(Millions of Dollars) |  | Sept. 30, 2023 |  | Dec. 31, 2022
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 51,377 |  |  | $ | 49,639 |
Natural gas plant |  | 9,005 |  |  | 8,514 |
Common and other property |  | 3,227 |  |  | 2,970 |
Plant to be retired (a) |  | 2,109 |  |  | 2,217 |
Construction work in progress |  | 2,951 |  |  | 2,124 |
Total property, plant and equipment |  | 68,669 |  |  | 65,464 |
Less accumulated depreciation |  | (18,363) |  |  | (17,502) |
Nuclear fuel |  | 3,282 |  |  | 3,183 |
Less accumulated amortization |  | (2,975) |  |  | (2,892) |
Property, plant and equipment, net |  | $ | 50,613 |  |  | $ | 48,253 |
(a)Amounts include Sherco Units 1, 2 and 3 and A.S. King for NSP-Minnesota; Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion for PSCo; and Tolk and coal generation assets at Harrington pending facility gas conversion for SPS. Amounts are presented net of accumulated depreciation.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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