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Balance Sheet Components Electric Utility Plant, Net (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Electric utility plant | $ 11,334 | $ 10,974
Construction work-in-progress | 503 | 429
Total cost | 11,837 | 11,403
Less: accumulated depreciation and amortization | (4,064) | (3,864)
Electric utility plant, net | $ 7,773 | $ 7,539

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