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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Common and other property |  | $ 3,702 | $ 3,515
Plant to be retired | [1] | 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
Electric plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant |  | 59,976 | 56,791
Natural gas plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant |  | $ 10,300 | $ 9,834
[1] | 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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