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Selected Balance Sheet Data (Tables) | 9 Months Ended
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Sep. 30, 2025
Balance Sheet Related Disclosures [Abstract] |
Accounts receivable, net |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Accounts receivable, net |  |  |  |
Accounts receivable |  | $ | 1,341 |  |  | $ | 1,360 |
Less allowance for bad debts |  | (95) |  |  | (111) |
Accounts receivable, net |  | $ | 1,246 |  |  | $ | 1,249 |
Inventories |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Inventories |  |  |  |
Materials and supplies |  | $ | 461 |  |  | $ | 406 |
Fuel |  | 145 |  |  | 164 |
Natural gas |  | 117 |  |  | 96 |
Total inventories |  | $ | 723 |  |  | $ | 666 |
Property, plant and equipment, net |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 59,976 |  |  | $ | 56,791 |
Natural gas plant |  | 10,300 |  |  | 9,834 |
Common and other property |  | 3,702 |  |  | 3,515 |
Plant to be retired (a) |  | 1,640 |  |  | 1,793 |
Construction work in progress |  | 8,017 |  |  | 4,720 |
Total property, plant and equipment |  | 83,635 |  |  | 76,653 |
Less accumulated depreciation |  | (20,957) |  |  | (19,852) |
Nuclear fuel |  | 3,634 |  |  | 3,491 |
Less accumulated amortization |  | (3,181) |  |  | (3,094) |
Property, plant and equipment, net |  | $ | 63,131 |  |  | $ | 57,198 |
(a)Amounts include Sherco 1 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 Unit 1 and 2 for SPS. Amounts are presented net of accumulated depreciation.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481834/980-20-45-1 + Details
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- Definition Tabular disclosure of all information related to inventories for utilities. + References No definition available. + Details
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