Regulatory Matters - EGTS - Other Regulatory Matters (Details) dekathermPerDay in Millions, $ in Millions	1 Months Ended			3 Months Ended			8 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2014 dekathermPerDay	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities							$ 7,369	$ 7,214
Asset retirement obligations
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities							250	345
EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Provision for rate refunds							90
Regulatory liabilities							627	532
Property, plant and equipment, net							4,504	$ 4,440
EGTS | Cancellation Of Atlantic Coast Pipeline Project
Schedule Of Regulatory Assets and Liabilities [Line Items]
Impairment of assets						$ 482
Impairment of assets, after-tax						359
EGTS | Atlantic Coast Pipeline Project, Available For Potential Modified Project
Schedule Of Regulatory Assets and Liabilities [Line Items]
Impairment of assets					$ 10
Impairment of assets, after-tax					7
Benefit from ARO revision					29
Benefit from ARO revision, after-tax					$ 20
Property, plant and equipment, net							40
EGTS | Atlantic Coast Pipeline Project, Available For Potential Modified Project | Asset retirement obligations
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities						$ 75
FERC Case, Disallowance Of Capitalized AFUDC, Resolved In December 2020 | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Litigation settlement, expense		$ 43
Litigation settlement, expense, after-tax		$ 31
Litigation settlement, reduction in expense				$ 11
Litigation settlement, reduction in expense, after tax				$ 8
FERC | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Firm transportation service (Dth per day) | dekathermPerDay			1.5
General Rate Case | FERC | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Requested rate increase (decrease)	$ 1,100
General Rate Case | FERC | Natural Gas, Storage | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Requested rate increase (decrease), percentage	85.00%
General Rate Case | FERC | Natural Gas, Gathering, Transportation, Marketing and Processing | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Requested rate increase (decrease), percentage	60.00%
General Rate Case, Transportation and Storage Revenues | FERC | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Approved rate increase (decrease)							160
General Rate Case, Depreciation Expense | FERC | EGTS
Schedule Of Regulatory Assets and Liabilities [Line Items]
Approved rate increase (decrease)							$ (30)