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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - USD ($) $ in Millions |  |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Oct. 10, 2022 | Sep. 15, 2022 | Apr. 01, 2022 | Oct. 31, 2022
2022 South Carolina Rate Case | PSCSC |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested rate increase (decrease) |  |  | $ 7 |
Requested rate increase (decrease), percentage, net of tax |  |  | 3.40% |
Approved return on equity percentage (as a percent) |  | 9.30% |  |
Approved capital structure, percentage |  | 52.20% |  |
Approved debt structure, percentage |  | 47.80% |  |
Approved rate decrease amount by state commission |  |  |  | $ 1
Tennessee Annual Review Mechanism | TPUC |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved return on equity percentage (as a percent) | 9.80% |  |  |

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