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Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Utility Plant and Depreciation [Line Items] |  |
Net | $ 14,184,058 | $ 13,727,575
Construction work in progress | 1,329,478 | 937,384
Intangible assets, net of accumulated amortization | 273,693 | 282,570
Nuclear fuel, net of accumulated amortization | 106,039 | 113,645
Total property, plant and equipment | 15,987,434 | 15,159,210
Electric Service |  |
Utility Plant and Depreciation [Line Items] |  |
Generation | 9,480,572 | 9,199,012
Transmission | 3,402,016 | 3,290,477
Distribution | 7,520,016 | 7,107,007
General plant | 1,286,057 | 1,241,389
Plant in service and held for future use | 21,688,661 | 20,837,885
Accumulated depreciation and amortization | (7,504,603) | (7,110,310)
Net | 14,184,058 | 13,727,575
Construction work in progress | 1,329,478 | 937,384
Intangible assets, net of accumulated amortization | 273,693 | 282,570
Nuclear fuel, net of accumulated amortization | 106,039 | 113,645
Total property, plant and equipment | 15,987,434 | 15,159,210
Electric Service | Variable Interest Entity |  |
Utility Plant and Depreciation [Line Items] |  |
Total property, plant and equipment | $ 94,166 | $ 98,036

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