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- Definition

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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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.

+ References

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- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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- Definition

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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Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 50	$ 111	$ 56
Distributions from equity investments, return of capital	$ 16	6	14
Electric Utilities and Infrastructure \| DATC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	50.00%
Electric Utilities and Infrastructure \| Pioneer
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	50.00%
Gas Utilities and Infrastructure \| Sabal Trail
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	7.50%
Gas Utilities and Infrastructure \| SustainRNG
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	29.68%
Gas Utilities and Infrastructure \| Sustain T&W
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	70.00%
Gas Utilities and Infrastructure \| Sustain Liberty
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	70.00%
Other \| NMC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	17.50%
Board representation and voting rights, ownership interest (as a percent)	25.00%
Piedmont
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 9	$ 31	8
Distributions from equity investments, return of capital	$ 1		$ 2
Piedmont \| Gas Utilities and Infrastructure \| Cardinal
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	21.49%
Piedmont \| Gas Utilities and Infrastructure \| Pine Needle
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	45.00%
Piedmont \| Gas Utilities and Infrastructure \| Hardy Storage
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest (as a percent)	50.00%