Property, Plant and Equipment, Net - PAC (Details) - PAC $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2024 USD ($) grant	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Utility plant in-service		$ 38,055	$ 34,013
Accumulated depreciation and amortization		(12,504)	(11,725)
Utility plant in-service, net		25,551	22,288
Utility plant in-service, net, excluding construction work-in-process		25,570	22,306
Construction work- in-progress		3,550	4,745
Property, plant and equipment, net		$ 29,120	$ 27,051
Depreciation and amortization rate		3.20%	3.40%	3.50%
Amount of acquisition adjustments		$ 156	$ 156
Acquisition adjustments, accumulated depreciation		145	145
Government grant, asset decrease		11
Government grant, operating expense decrease		4
GRIP awards
Property, Plant and Equipment [Line Items]
Number of grants | grant	2
Government grant, award amount	$ 150
Electric vehicle infrastructure grant
Property, Plant and Equipment [Line Items]
Government grant, award amount		6
Energy efficiency grant
Property, Plant and Equipment [Line Items]
Government grant, award amount		$ 5
Minimum
Property, Plant and Equipment [Line Items]
Useful life, generation		15 years
Useful life, transmission		60 years
Useful life, distribution		20 years
Useful life, intangible asset		2 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life, generation		59 years
Useful life, transmission		90 years
Useful life, distribution		75 years
Useful life, intangible asset		75 years
Generation
Property, Plant and Equipment [Line Items]
Utility plant in-service		$ 14,316	13,904
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service		10,939	8,216
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service		9,842	9,060
Intangible plant and other assets
Property, Plant and Equipment [Line Items]
Utility plant in-service		2,958	2,833
Nonregulated assets
Property, Plant and Equipment [Line Items]
Utility plant in-service, net, excluding construction work-in-process		$ 19	$ 18
Nonregulated assets | Minimum
Property, Plant and Equipment [Line Items]
Useful life, other		14 years
Nonregulated assets | Maximum
Property, Plant and Equipment [Line Items]
Useful life, other		75 years