Property Plant and Equipment Property Plant and Equipment (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 12,143	$ 11,226
Accumulated Depreciation		(2,892)	(2,690)
Property, plant and equipment, net		9,251	8,536
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		11,443	10,752
Plant to be Retired [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	182	248
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 518	$ 226

[1] Amounts include Tolk Unit 1 and 2. The Dec. 31, 2023 amounts also include coal generation assets at Harrington. The coal assets were retired in 2024 and the conversion to natural gas is in process. Amounts are reported net of accumulated depreciation.