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Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Utility Plant and Depreciation [Line Items] |  |
Net | $ 13,198,435 | $ 12,370,614
Construction work in progress | 808,133 | 1,170,062
Palo Verde sale leaseback, net of accumulated depreciation | 101,906 | 105,775
Intangible assets, net of accumulated amortization | 290,564 | 262,902
Nuclear fuel, net of accumulated amortization | 123,500 | 120,217
Total property, plant and equipment | 14,522,538 | 14,029,570
Electric Service |  |
Utility Plant and Depreciation [Line Items] |  |
Generation | 8,916,872 | 8,285,514
Transmission | 3,095,907 | 3,033,579
Distribution | 6,690,697 | 6,378,345
General plant | 1,132,816 | 1,039,190
Plant in service and held for future use | 19,836,292 | 18,736,628
Accumulated depreciation and amortization | (6,637,857) | (6,366,014)
Net | 13,198,435 | 12,370,614
Construction work in progress | 808,133 | 1,170,062
Palo Verde sale leaseback, net of accumulated depreciation | 101,906 | 105,775
Intangible assets, net of accumulated amortization | 290,564 | 262,902
Nuclear fuel, net of accumulated amortization | 123,500 | 120,217
Total property, plant and equipment | $ 14,522,538 | $ 14,029,570

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