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Property Plant and Equipment Major classes of property, plant and equipment (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | $ 69,692 | $ 65,464
Accumulated depreciation and amortization |  | (18,399) | (17,502)
Property, plant and equipment, net |  | 51,642 | 48,253
Electric plant |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 52,494 | 49,639
Natural gas plant |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 9,080 | 8,514
Common and other property |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 3,190 | 2,970
Plant to be retired |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | [1] | 2,055 | 2,217
CWIP |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 2,873 | 2,124
Nuclear fuel |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment |  | 3,337 | 3,183
Accumulated depreciation and amortization |  | $ (2,988) | $ (2,892)
[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 and coal generation assets at Harrington pending facility gas conversion for SPS. The Dec. 31, 2022 balance also includes Sherco 2, which was retired on Dec. 31, 2023. Amounts are presented net of accumulated depreciation.

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