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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - Tennessee Annual Review Mechanism - TPUC - USD ($) $ in Millions | Sep. 11, 2023 | May 19, 2023 | Oct. 10, 2022
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Public Utilities, General Disclosures [Line Items] |  |  |
Requested rate increase (decrease) | $ 29 | $ 42 |
Approved return on equity (as a percent) |  |  | 9.80%
Approved rate decrease amount by state commission | (40) |  |
Reconciliation cost of service | $ 11 |  |

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