Property Plant and Equipment Property Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 4,877	$ 4,478
Accumulated Depreciation	1,640	1,564
Property, Plant and Equipment, Net	3,237	2,914
Electric plant
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	3,845	3,579
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	502	465
Common and other property
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	278	260
CWIP
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 252	$ 174