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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - 2024 North Carolina Rate Case - NCUC $ in Millions	Sep. 13, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Increase in net annual retail revenues in the first year	$ 88
Increase in net annual retail revenue after the first year	$ 10
Requested return on equity (as a percent)	9.80%
Equity ratio (as a percent)	52.30%

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Public Utilities, Approved Rate Increase (Decrease), Amount, After Year One

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Percentage of public utility's requested return on equity.

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