Effective Income Tax Rate Reconciliation, State and Local Taxes, Increase (Reduction), Amount

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- Definition

Public Utilities, Requested Rate Increase (Decrease), Gross Amount

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- Definition

Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)

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

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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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- Definition

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

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

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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 rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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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
	Oct. 31, 2019	Aug. 13, 2019	Apr. 01, 2019	Jun. 30, 2019	Nov. 30, 2018
NCUC IMR Petition Filed April 2019 \| NCUC
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission				$ 9
NCUC IMR Petition Filed October 2019 \| NCUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 11
Tennessee Integrity Management Rider Filing November 2018 \| TPUC
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission					$ 4
2019 North Carolina Rate Case \| NCUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)		$ 83	$ 83
Requested rate increase (decrease), percent			9.00%
Requested return on equity, percentage		9.70%
Requested capital structure, percentage		52.00%
Requested debt structure, percentage		48.00%
Requested gross rate case revenue increase		$ 109
Measurement period adjustments		(23)
Tax benefit from change in enacted tax rates		(37)
North Carolina DOR \| State \| 2019 North Carolina Rate Case \| NCUC
Public Utilities, General Disclosures [Line Items]
Approved increase (decrease) through EDIT Rider		$ (21)