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Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Utility Plant and Depreciation [Line Items] |  |
Net | $ 15,803,127 | $ 14,522,268
Construction work in progress | 1,724,004 | 1,882,791
Intangible assets, net of accumulated amortization | 267,110 | 258,880
Nuclear fuel, net of accumulated amortization | 99,490 | 100,119
Total property, plant and equipment | 17,980,157 | 16,854,354
Electric Service |  |
Utility Plant and Depreciation [Line Items] |  |
Generation | 10,446,291 | 9,563,145
Transmission | 3,773,253 | 3,589,456
Distribution | 8,448,293 | 7,951,867
General plant | 1,543,330 | 1,347,678
Plant in service and held for future use | 24,211,167 | 22,452,146
Accumulated depreciation and amortization | (8,408,040) | (7,929,878)
Net | 15,803,127 | 14,522,268
Construction work in progress | 1,724,004 | 1,882,791
Intangible assets, net of accumulated amortization | 267,110 | 258,880
Nuclear fuel, net of accumulated amortization | 99,490 | 100,119
Total property, plant and equipment | 17,980,157 | 16,854,354
Electric Service | Variable Interest Entity |  |
Utility Plant and Depreciation [Line Items] |  |
Total property, plant and equipment | $ 86,426 | $ 90,296

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