Material Contingencies - Additional Information (Details) $ in Millions		1 Months Ended			9 Months Ended
	Mar. 12, 2014 building people	Aug. 31, 2022	Jun. 30, 2022	Feb. 28, 2017 USD ($)	Sep. 30, 2022 USD ($) lawsuit	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Accrued regulatory liability					$ 4,717	$ 4,381
Guarantee obligations maximum exposure					$ 2,232	2,157
Debt instrument term			364 days
Clean Energy Businesses
Loss Contingencies [Line Items]
Debt instrument term		364 days
Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Loss Contingencies [Line Items]
Estimated project cost percentage					175.00%
Financial Guarantee for Indemnity Agreements for Surety Bonds
Loss Contingencies [Line Items]
Guarantee obligations maximum exposure					$ 70
Financial Guarantee For Obligations Under Senior Unsecured Term Loan Credit Agreement
Loss Contingencies [Line Items]
Guarantee obligations maximum exposure					$ 150
NY Transco | Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Loss Contingencies [Line Items]
Ownership interest, percentage					45.70%
Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability					$ 4	$ 12
Manhattan Explosion and Fire
Loss Contingencies [Line Items]
Number of buildings destroyed by fire | building	2
Number of people died in explosion and fire incident | people	8
Number of people injured in explosion and fire incident (more than) | people	50
Amount of costs that will not recover from customers				$ 126
Number of pending lawsuits | lawsuit					80
Loss contingency accrual					$ 40		$ 40
Insurance receivable					$ 40		$ 40
Manhattan Explosion and Fire | Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability				$ 27