Business Acquisition, Accounting Revision Period, Twelve Months

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Liquefied natural gas storage capacity (billion cubic feet)

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Natural gas company-owned working storage capacity (billion cubic feet)

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Natural gas operated storage capacity (billion cubic feet)

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Natural gas transmission line miles

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Natural gas transmission lines transportation per day capacity (billion cubic feet)

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- Definition

Ownership Percentage Acquired

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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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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Business Acquisition - Narrative (Details) $ in Millions					3 Months Ended		9 Months Ended
Business Acquisition - Narrative (Details) $ in Millions	Jul. 14, 2021 USD ($)	Nov. 02, 2020 USD ($)	Nov. 01, 2020 USD ($) mi Bcf	Oct. 05, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jul. 03, 2020 USD ($)
Business Acquisition [Line Items]
Operating revenue					$ 6,968	$ 6,193	$ 19,113	$ 15,332
Net income (loss)					1,922	$ 2,842	4,207	$ 4,628
Goodwill					11,572		11,572		$ 11,506
Natural Gas Transmission and Storage
Business Acquisition [Line Items]
Payments to acquire businesses			$ 2,500
Long-term debt, less current portion			4,415							$ 5,600
Operating revenue					516		1,563
Net income (loss)					$ 74		$ 247
Accounting revision period							12 months
Goodwill			$ 1,741
Natural Gas Transmission and Storage \| Goodwill
Business Acquisition [Line Items]
Useful life, intangible asset			15 years
Natural Gas Transmission and Storage \| Domestic Tax Authority and State and Local Jurisdiction
Business Acquisition [Line Items]
Goodwill			$ 900
Natural Gas Transmission and Storage \| Primary Beneficiary \| Cove Point LNG, LP \| Other Ownership Interest
Business Acquisition [Line Items]
Variable interest entity, ownership percentage			25.00%
Natural Gas Transmission and Storage \| Primary Beneficiary \| Cove Point LNG, LP \| General Partner
Business Acquisition [Line Items]
Variable interest entity, ownership percentage			100.00%
Natural Gas Transmission and Storage \| Primary Beneficiary \| Cove Point LNG, LP \| Limited Partner
Business Acquisition [Line Items]
Variable interest entity, ownership percentage			25.00%
Natural Gas Transmission and Storage \| Iroquois Gas Transmission System, L.P.
Business Acquisition [Line Items]
Equity method investment, ownership percentage			50.00%
Natural Gas Transmission and Storage \| Eastern Gas Transmission, Inc.
Business Acquisition [Line Items]
Ownership percentage acquired			100.00%
Natural Gas Transmission and Storage \| Carolina Gas Transmission, LLC
Business Acquisition [Line Items]
Ownership percentage acquired			100.00%
Natural Gas Transmission and Storage Transaction
Business Acquisition [Line Items]
Miles of natural gas transmission lines \| mi			5,400
Natural gas transmission lines transportation per day capacity \| Bcf			12.5
Natural gas operated storage capacity \| Bcf			420
Natural gas company-owned working storage capacity \| Bcf			306
Liquefied natural gas storage capacity \| Bcf			14.6
Questar Pipeline Group and Dominion Questar Transaction
Business Acquisition [Line Items]
Payments to acquire businesses	$ 1,300	$ 1,300		$ 1,300
Long-term debt, less current portion				$ 430