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Regulatory Matters (Regulatory Matters Narrative - Piedmont) (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] |  |  |
Approved return on equity percentage (as a percent) |  |  | 9.80%
Requested rate increase (decrease), amount | $ 29 | $ 42 |
Recovery amounts | 11 |  |
Approved rate increase (decrease), amount | $ 40 |  |

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