Plants Rolled Into Base Rate

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Public Utilities, Increase in Annual Revenue, Percent

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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- Definition

Percentage of public utility's approved return on equity.

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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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Percentage of public utility's requested debt to capital, including debt and equity.

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- Definition

Percentage of public utility's requested equity to capital, including debt and equity.

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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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Regulatory Matters (Regulatory Matters Narrative - Piedmont) (Details) - Piedmont - USD ($) $ in Millions						1 Months Ended
	Sep. 07, 2021	Jul. 28, 2021	May 06, 2021	Mar. 22, 2021	Jul. 02, 2020	Dec. 31, 2020
2020 Tennessee Rate Case \| TPUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 30	$ 26
Increase in annual revenue, percent					15.00%
Approved rate increase, amount			$ 16
Approved return on equity percentage			9.80%
2021 North Carolina Rate Case \| NCUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 67			$ 109
Increase in annual revenue, percent				10.00%
Plants rolled into base rate				70.00%
Requested rate increase (decrease), amended amount		$ 97
Requested return on equity, percent	9.60%
Public utilities, requested equity capital structure, percentage	51.60%
Public utilities, requested debt capital structure, percentage	48.40%