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Balance Sheet Components Electric Utility Plant, Net (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Electric utility plant | $ 9,766 | $ 9,534
Construction work-in-progress | 386 | 213
Total cost | 10,152 | 9,747
Less: accumulated depreciation and amortization | (3,514) | (3,313)
Electric utility plant, net | $ 6,638 | $ 6,434

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