Summary of Significant Accounting Policies and Other Matters - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended		9 Months Ended	12 Months Ended
	Oct. 31, 2023 USD ($)	Jan. 31, 2016 mi	Sep. 30, 2023 USD ($) project $ / shares	Dec. 31, 2019 USD ($)	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)			8.80%			9.60%	10.20%	11.30%
Number of miles in pipeline construction | mi		300
Cash contributions for equity method investments			$ 530	$ 530
Equity method investment, ownership percentage, expected percentage			0.073
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 | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Cash contributions for equity method investments	$ 7,200
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