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Balance Sheet Components Electric Utility Plant, Net (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Electric utility plant $ 8,251us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService $ 8,161us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Construction work-in-progress 478us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 417us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Total cost 8,729us-gaap_PropertyPlantAndEquipmentGross 8,578us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization (2,940)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation (2,899)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Electric utility plant, net $ 5,789us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet $ 5,679us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet