Summary of Significant Accounting Policies - Average Depreciation Rates (Detail)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Natural gas distribution | Delmarva
Property, Plant and Equipment [Line Items]
Average depreciation rates	[1]	2.10%	2.50%	2.50%
Natural gas distribution | Florida
Property, Plant and Equipment [Line Items]
Average depreciation rates	[2],[3]	2.70%	2.20%	2.50%
Natural gas transmission | Delmarva
Property, Plant and Equipment [Line Items]
Average depreciation rates		2.70%	2.70%	2.70%
Natural gas transmission | Florida
Property, Plant and Equipment [Line Items]
Average depreciation rates		2.40%	2.40%	2.40%
Natural gas transmission | OHIO
Property, Plant and Equipment [Line Items]
Average depreciation rates	[4]	2.30%	5.00%	5.00%
Electric distribution | Florida
Property, Plant and Equipment [Line Items]
Average depreciation rates		2.40%	2.40%	2.80%

[1] (1) Average for 2024 includes the impact of the depreciation study that was approved by the Maryland PSC for Maryland and Sandpiper.

[2] (2) Includes the impact of FCG beginning in 2024.

[3] (3) Average for 2023 includes the impact of the depreciation study that was approved by the Florida PSC in connection with the natural gas base rate proceeding.

[4] (4) 2024 rate excludes the impact of cumulative adjustments related to a change in useful lives of certain assets. Such adjustments were not material to the Company's results of operations for the year ended December 31, 2024