Balance Sheet Components Balance Sheet Components Public Utility Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	$ 4,436	$ 4,749
Public Utilities, Property, Plant and Equipment, Transmission	970	848
Public Utilities, Property, Plant and Equipment, Distribution	4,136	3,917
Public Utilities, Property, Plant and Equipment, General	679	656
Public Utilities, Property, Plant and Equipment, Intangible	753	758
Public Utilities, Property, Plant and Equipment, Plant in Service	10,974	10,928
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,864	4,095
In service, net	7,110	6,833
Construction work-in-progress	429	328
Public Utilities, Property, Plant and Equipment, Net	$ 7,539	$ 7,161