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		$ 10,615	$ 10,109
Accumulated Depreciation		(2,486)	(2,271)
Property, plant and equipment, net		8,129	7,838
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		10,182	9,639
Plant to be Retired [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	266	299
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 167	$ 171

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