Summary of Significant Accounting Policies and Other Matters - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2016 mi	Dec. 31, 2019 USD ($)	Jun. 30, 2023 USD ($) project $ / shares	Mar. 01, 2023 project	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Par value of common stock (in usd per share) | $ / shares			$ 0.10
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses
Schedule of Equity Method Investments [Line Items]
Tax equity projects | project			3	2
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)			9.40%		9.60%	10.20%	11.30%
Number of miles in pipeline construction | mi	300
Cash contributions for equity method investments | $		$ 530
Equity method investment, ownership percentage, expected percentage			0.08
Equity method investment, project percent completion (in percent)			94.00%		94.00%
Equity method investments | $			$ 111
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC | Mountain Valley Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	12.50%
Broken Bow II | Clean Energy Businesses | Electric Energy (MWh)
Schedule of Equity Method Investments [Line Items]
Deferred projects | project			1	1