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		$ 11,226	$ 10,615
Accumulated Depreciation		(2,690)	(2,486)
Property, plant and equipment, net		8,536	8,129
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		10,752	10,182
Plant to be Retired [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	248	266
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 226	$ 167

[1] Amounts include Tolk Unit 1 and 2 and coal generation assets at Harrington pending facility gas conversion. Amounts are reported net of accumulated depreciation.