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Balance Sheet Components Electric Utility Plant, Net (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Electric utility plant | $ 10,416 | $ 10,344
Construction work-in-progress | 200 | 346
Total cost | 10,616 | 10,690
Less: accumulated depreciation and amortization | (3,869) | (3,803)
Electric utility plant, net | $ 6,747 | $ 6,887

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