Property Plant and Equipment Major classes of property, plant and equipment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 76,653	$ 69,692
Accumulated depreciation and amortization	(19,852)	(18,399)
Property, Plant and Equipment, Gross, Including Nuclear Fuel	3,491	3,337
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Nuclear Fuel	3,094	2,988
Property, plant and equipment, net	57,198	51,642
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment	56,791	52,494
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment	9,834	9,080
Common and other property
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,515	3,190
Plant to be retired
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,793	2,055
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 4,720	$ 2,873