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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | $ 59,383 | $ 55,844
Less accumulated depreciation and amortization |  | (17,456) | (16,735)
Property, plant and equipment, net |  | 42,227 | 39,483
Electric plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 46,531 | 44,355
Natural gas plant |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 6,899 | 6,560
Common and other property |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 2,401 | 2,341
Plant to be retired |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | [1] | 287 | 259
Construction work in progress |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 3,265 | 2,329
Nuclear fuel |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross |  | 2,930 | 2,909
Less accumulated depreciation and amortization |  | $ (2,630) | $ (2,535)
[1] | The CPUC has approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively, and PSCo’s Craig 1 in approximately 2025. Amounts are presented net of accumulated depreciation.

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