Selected Balance Sheet Data - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Public Utility, Property, Plant and Equipment [Line Items]
Common and other property	$ 311	$ 309
Construction work in progress	468	406
Total property, plant and equipment	5,504	5,365
Less accumulated depreciation	(1,725)	(1,695)
Property, plant and equipment, net	3,779	3,670
Electricity Generation Plant, Non-Nuclear
Public Utility, Property, Plant and Equipment [Line Items]
Plant	4,170	4,103
Natural Gas Processing Plant
Public Utility, Property, Plant and Equipment [Line Items]
Plant	$ 555	$ 547