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Regulatory Matters (Duke Energy Progress Narrative) (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2020 USD ($) | Oct. 16, 2020 | Jul. 31, 2020 USD ($) | Jun. 17, 2020 USD ($) | Oct. 30, 2019 USD ($) | Oct. 11, 2019 | Sep. 30, 2019 USD ($) | May 21, 2019 USD ($) | Nov. 08, 2018 USD ($) | Jun. 22, 2018 USD ($) | Feb. 28, 2018 | Nov. 22, 2017 | Aug. 25, 2017 USD ($) | Jun. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 27, 2020 MW | Jul. 01, 2020 USD ($) | Feb. 07, 2020 USD ($) | Jan. 29, 2020 USD ($) MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 984 | $ (8) | $ 402 |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,062 | 15,018 |  |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 499 | 12 | 33 |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,468 | 4,678 |  |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 476 | 17 | $ 192 |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,469 | 3,910 |  |  |  |  |
North Carolina Utilities Commission | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount | $ 920 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Utilities Commission | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount | $ 287 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 North Carolina Rate Case | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 477 |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 420 |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  |  |  |  | 9.90% |  |  |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  |  |  |  |  |  |  |  |  |  | 52.00% |  |  |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 68 |  |  |  |  |  |  |
2017 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  | $ 647 |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  |  |  |  |  |  |  |  |  | 52.00% |  |  |  |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  | $ 14 |  |  |  |  |  |  |
2019 North Carolina Rate Case | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 464 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  | 12.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested gross rate case revenue increase |  |  |  |  | $ 586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), rider reduction, tax cuts and jobs act and return deferred revenue |  |  |  |  | 122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested EDIT rider decrease |  |  |  |  | $ 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested gross rate case revenue increase |  |  |  |  |  |  | $ 445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested EDIT rider decrease |  |  |  |  |  |  | 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | North Carolina Utilities Commission | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  | 52.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  | 48.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | North Carolina Utilities Commission | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  | $ 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  | 52.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  | 48.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs - operation maintenance |  |  |  |  |  |  | 168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs - capital investments |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Dorian Storm Damage | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm deferral - operation maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22 |
Storm deferral - requested supplemental true-up |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 |  |
2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 59 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure, percentage |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved debt structure, percentage |  |  |  |  |  |  |  | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit from change in enacted tax rates |  |  |  |  |  |  |  | $ (17) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment |  |  |  |  |  |  |  | $ (12) |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 168 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure, percentage |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved debt structure, percentage |  |  |  |  |  |  |  | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit from change in enacted tax rates |  |  |  |  |  |  |  | $ (66) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment |  |  |  |  |  |  |  | (45) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Western Carolinas Modernization Plan | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar generation capacity plants (in MW) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
FERC Return on Equity Complaint, North Carolina Eastern Municipal Power Agency | FERC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FERC Return on Equity Complaint, North Carolina Electric Membership Corporation | FERC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement, Estimated Annual Revenue Requirement | North Carolina Utilities Commission | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement, Estimated Annual Revenue Requirement | North Carolina Utilities Commission | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  | $ 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,102 | 1,399 |  |  |  |  |
Storm cost deferrals | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 785 | 801 |  |  |  |  |
Storm cost deferrals | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205 | 178 |  |  |  |  |
Storm cost deferrals | Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 | 179 |  |  |  |  |
AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,408 | 4,084 |  |  |  |  |
AROs – coal ash | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,347 | 1,834 |  |  |  |  |
AROs – coal ash | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,414 | $ 1,696 |  |  |  |  |
AROs – coal ash | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denied recovery costs |  |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AROs – coal ash | 2018 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 96 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denied recovery costs |  |  |  |  |  |  |  | 115 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ashville Depreciation Expense, Property Taxes, Incremental O&M and Carrying Costs | Western Carolinas Modernization Plan | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved annual rate increase (decrease), amount |  |  |  | $ 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State | North Carolina DOR | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved increase (decrease) through EDIT Rider |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
State | North Carolina DOR | 2018 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved increase (decrease) through EDIT Rider |  |  |  |  |  |  |  | $ (17) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asheville Plant | Western Carolinas Modernization Plan | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of retired plant | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 376
Generation facilities retired net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 214

X
- Definition Coal-Fired Generation Capacity Potential Plants Retired, in Megawatts + References No definition available. + Details
Name: | duk_CoalFiredGenerationCapacityPotentialPlantsRetiredInMegawatts
Namespace Prefix: | duk_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

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- Definition Effective Income Tax Rate Reconciliation, State and Local Taxes, Increase (Reduction), Amount + References No definition available. + Details
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