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Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - USD ($) $ in Millions |  |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2019 | Aug. 13, 2019 | Apr. 01, 2019 | Jun. 30, 2019 | Nov. 30, 2018
NCUC IMR Petition Filed April 2019 | NCUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  | $ 9 |
NCUC IMR Petition Filed October 2019 | NCUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested rate increase (decrease) | $ 11 |  |  |  |
Tennessee Integrity Management Rider Filing November 2018 | TPUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  | $ 4
2019 North Carolina Rate Case | NCUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested rate increase (decrease) |  | $ 83 | $ 83 |  |
Requested rate increase (decrease), percent |  |  | 9.00% |  |
Requested return on equity, percentage |  | 9.70% |  |  |
Requested capital structure, percentage |  | 52.00% |  |  |
Requested debt structure, percentage |  | 48.00% |  |  |
Requested gross rate case revenue increase |  | $ 109 |  |  |
Measurement period adjustments |  | (23) |  |  |
Tax benefit from change in enacted tax rates |  | (37) |  |  |
North Carolina DOR | State | 2019 North Carolina Rate Case | NCUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved increase (decrease) through EDIT Rider |  | $ (21) |  |  |

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