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Balance Sheet Components Electric Utility Plant, Net (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Electric utility plant | $ 10,778 | $ 10,344
Construction work-in-progress | 258 | 346
Total cost | 11,036 | 10,690
Less: accumulated depreciation and amortization | (4,022) | (3,803)
Electric utility plant, net | $ 7,014 | $ 6,887

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