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Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Utility Plant and Depreciation [Line Items] |  |
Net | $ 14,522,268 | $ 14,184,058
Construction work in progress | 1,882,791 | 1,329,478
Intangible assets, net of accumulated amortization | 258,880 | 273,693
Nuclear fuel, net of accumulated amortization | 100,119 | 106,039
Total property, plant and equipment | 16,854,354 | 15,987,434
Electric Service |  |
Utility Plant and Depreciation [Line Items] |  |
Generation | 9,563,145 | 9,480,572
Transmission | 3,589,456 | 3,402,016
Distribution | 7,951,867 | 7,520,016
General plant | 1,347,678 | 1,286,057
Plant in service and held for future use | 22,452,146 | 21,688,661
Accumulated depreciation and amortization | (7,929,878) | (7,504,603)
Net | 14,522,268 | 14,184,058
Construction work in progress | 1,882,791 | 1,329,478
Intangible assets, net of accumulated amortization | 258,880 | 273,693
Nuclear fuel, net of accumulated amortization | 100,119 | 106,039
Total property, plant and equipment | 16,854,354 | 15,987,434
Electric Service | Variable Interest Entity |  |
Utility Plant and Depreciation [Line Items] |  |
Total property, plant and equipment | $ 90,296 | $ 94,166

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