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Balance Sheet Components Electric Utility Plant, Net (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Electric utility plant | $ 11,931 | $ 11,838
Construction work-in-progress | 349 | 313
Total cost | 12,280 | 12,151
Less: accumulated depreciation and amortization | (4,218) | (4,146)
Electric utility plant, net | $ 8,062 | $ 8,005

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