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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | $ 68,669 | $ 65,464
Less accumulated depreciation and amortization |  | (18,363) | (17,502)
Property, plant and equipment, net |  | 50,613 | 48,253
Electric plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 51,377 | 49,639
Natural gas plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 9,005 | 8,514
Common and other property |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 3,227 | 2,970
Plant to be retired |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | [1] | 2,109 | 2,217
Construction work in progress |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 2,951 | 2,124
Nuclear fuel |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 3,282 | 3,183
Less accumulated depreciation and amortization |  | $ (2,975) | $ (2,892)
[1] | 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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