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		$ 27,004	$ 25,317
Accumulated depreciation		5,969	5,665
Property, plant and equipment, net		21,035	19,652
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		16,698	15,771
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		6,321	5,949
Common and other property
Property, Plant and Equipment [Line Items]
Property, plant and equipment		1,472	1,415
Plant to be retired
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	1,203	1,305
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 1,310	$ 877

[1] Amounts include Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are presented net of accumulated depreciation.