Cap on Revenue Increase

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- Definition

Increase in Annual Revenue, Percent

+ References

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- Definition

Public Utilities, Requested Rate Increase (Decrease), Rider Reduction

+ References

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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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No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

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- Definition

Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - USD ($) $ in Millions				1 Months Ended
	Feb. 16, 2021	Jul. 02, 2020	Aug. 13, 2019	Dec. 31, 2020
2020 Tennessee Rate Case \| TPUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)		$ 30		$ 26
Increase in annual revenue		15.00%
2020 Tennessee Rate Case \| TPUC \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 16
Requested return on equity, percentage	9.80%
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement \| North Carolina Utilities Commission
Public Utilities, General Disclosures [Line Items]
Requested return on equity, percentage			9.70%
Requested capital structure, percentage			52.00%
Requested debt structure, percentage			48.00%
Requested rate increase (decrease), amended, amount			$ 109
Requested EDIT rider decrease			(23)
Tax benefit from change in enacted tax rates			37
Cap on revenue increase			83
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement \| North Carolina DOR
Public Utilities, General Disclosures [Line Items]
Tax benefit from change in enacted tax rates			$ 21