Cash Flows Discount Rate

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Equity Method Investment, Other Than Temporary Impairment, Net Of Tax

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Equity Method Investment, Ownership Percentage, Expected Increase (Decrease)

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Equity Method Investment, Project Percent Completion

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Equity Method Investment, Realized Gain (Loss) On Disposal, Before Tax

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Increase (Decrease) In Deferred Tax Assets

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Long Term Firm Transportation Contract Period

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Number Of Miles In Pipeline Construction

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Fair value portion of investments accounted under the equity method.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Summary of Significant Accounting Policies and Other Matters - Investments (Details)	1 Months Ended	12 Months Ended
	May 31, 2021 USD ($)	Dec. 31, 2022 USD ($) mi	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2016
Stagecoach
Schedule of Equity Method Investments [Line Items]
Loss on sale of investment (pre-tax)			$ 212,000,000
Loss on sale of investment			147,000,000
Equity method investments						$ 630,000,000	$ 667,000,000
Mountain Valley Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 530,000,000	530,000,000
CET \| Mountain Valley Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investments		111,000,000	$ 111,000,000
CET \| Stagecoach \| Subsidiaries
Schedule of Equity Method Investments [Line Items]
Proceeds from sale	$ 1,225,000,000
Equity method investment, ownership percent (in percent)	50.00%		50.00%
Impairment loss		$ 414,000,000
CET Gas \| Stagecoach \| Subsidiaries
Schedule of Equity Method Investments [Line Items]
Proceeds from sale	$ 629,000,000
CET Gas \| Mountain Valley Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percent (in percent)		9.60%	10.20%	11.30%
Impairment loss		$ 0	$ 231,000,000	$ 320,000,000
Equity method investments									$ 530,000,000
Number of miles in pipeline construction \| mi		300
Expected reduction in equity interest		8.00%
Project, percent completion		94.00%	94.00%
Long -term firm transportation contract period		20 years
Cash flows discount rate		8.30%
Impairment loss, after tax			$ 162,000,000	223,000,000
Carrying value of investment			111,000,000	342,000,000	$ 342,000,000			$ 662,000,000
Deferred tax assets		$ 130,000,000	130,000,000	$ 53,000,000
Increase in deferred tax assets			$ 77,000,000
CET Gas \| Mountain Valley Pipeline \| Mountain Valley Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percent (in percent)										12.50%