Balance Sheet Components Balance Sheet Components Public Utility Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	$ 4,749	$ 4,600
Public Utilities, Property, Plant and Equipment, Transmission	848	580
Public Utilities, Property, Plant and Equipment, Distribution	3,917	3,838
Public Utilities, Property, Plant and Equipment, General	656	611
Public Utilities, Property, Plant and Equipment, Intangible	758	715
Public Utilities, Property, Plant and Equipment, Plant in Service	10,928	10,344
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	4,095	3,803
Construction work-in-progress	328	346
Public Utilities, Property, Plant and Equipment, Net	6,833	6,541
Property, Plant and Equipment, Net	$ 7,161	$ 6,887