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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 07, 2021 | Jul. 28, 2021 | May 06, 2021 | Mar. 22, 2021 | Jul. 02, 2020 | Dec. 31, 2020
2020 Tennessee Rate Case | TPUC |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 30 | $ 26
Increase in annual revenue, percent |  |  |  |  | 15.00% |
Approved rate increase (decrease) amount by state commission |  |  | $ 16 |  |  |
Approved return on equity, percentage |  |  | 9.80% |  |  |
2021 North Carolina Rate Case | North Carolina Utilities Commission |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease) | $ 67 |  |  | $ 109 |  |
Increase in annual revenue, percent |  |  |  | 10.00% |  |
Plants rolled into base rate |  |  |  | 70.00% |  |
Requested rate increase (decrease), amended, amount |  | $ 97 |  |  |  |
Requested return on equity, percentage | 9.60% |  |  |  |  |
Requested capital structure, percentage | 51.60% |  |  |  |  |
Requested debt structure, percentage | 48.40% |  |  |  |  |

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