Property Plant and Equipment Property Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 4,478	$ 4,138
Accumulated Depreciation	1,564	1,478
Property, Plant and Equipment, Net	2,914	2,660
Electric plant
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	3,579	3,348
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	465	423
Common and other property
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	260	233
CWIP
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 174	$ 134