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Regulatory Matters (Duke Energy Progress Narrative) (Details) customer in Thousands, $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) customer | May 21, 2019 USD ($) | Nov. 08, 2018 USD ($) | Nov. 22, 2017 | Aug. 25, 2017 USD ($) | Jun. 01, 2017 USD ($) | Nov. 04, 2015 plant MW | Feb. 28, 2018 | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  | $ 4,097 | $ 3,073 | $ 4,266
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 15,018 | 15,622 |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  | 102,127 | 91,694 |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  | 962 | 827 | 1,007
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 4,678 | 4,814 |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  | 22,934 | 20,398 |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  | 1,714 | 1,374 | $ 1,866
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 3,910 | 3,977 |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  | 32,397 | 29,245 |
2017 North Carolina Rate Case | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 477 |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  |  |  | 14.90% |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  |  |  |  |  | $ 420 |  |  |  |  |  |
Requested rate increase (decrease), amended, percentage |  |  |  |  |  |  | 13.00% |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  | 9.90% |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  |  |  | 52.00% |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  |  |  | 48.00% |  |  |  |  |  |  |  |
Total income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  | $ (68) |  |  |
2017 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 647 |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  |  | 13.60% |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  | 9.90% |  |  |  |
Requested capital structure, percentage |  |  |  |  |  |  |  |  | 52.00% |  |  |  |
Requested debt structure, percentage |  |  |  |  |  |  |  |  | 48.00% |  |  |  |
Total income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  |  | $ (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 |  |  |  |  |  |  |  |  |  |  |
Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs - operation maintenance |  |  |  |  |  |  |  |  |  |  | 205 |  |
Estimated storm costs - capital investments |  |  |  |  |  |  |  |  |  |  | $ 4 |  |
2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 59 |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  | 10.30% |  |  |  |  |  |  |  |  |
Measurement period adjustments |  |  | $ (12) | $ (10) |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
2018 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 168 |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Measurement period adjustments |  |  | $ (45) | $ (46) |  |  |  |  |  |  |  |  |
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) | 66 |  |  |  |  |  |  |  |  |
Western Carolinas Modernization Plan | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plants to be constructed | plant |  |  |  |  |  |  |  | 2 |  |  |  |  |
Plants to be constructed capacity (in MW) | MW |  |  |  |  |  |  |  | 280 |  |  |  |  |
Western Carolinas Modernization Plan | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Estimated capital cost |  |  |  |  |  |  |  |  |  |  | $ 893 |  |
North Carolina | Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Customers experiencing outages | customer |  | 270 |  |  |  |  |  |  |  |  |  |  |
South Carolina | Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Customers experiencing outages | customer |  | 30 |  |  |  |  |  |  |  |  |  |  |
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 1,399 | 1,117 |
Storm cost deferrals | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 801 | 571 |
Storm cost deferrals | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 178 | 160 |
Storm cost deferrals | Hurricane Dorian Storm Damage | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 179 |  |
AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 4,084 | 4,255 |
AROs – coal ash | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 1,834 | 2,051 |
AROs – coal ash | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | $ 1,696 | 1,725 |
AROs – coal ash | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  | 4 | $ 51 |  |  |  |  |  |  |  |  |
Recovery period |  |  |  | 5 years |  |  |  |  |  |  |  |  |
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 | $ 242 |  |  |  |  |  |  |  |  |
Recovery period |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Denied recovery costs |  |  | 115 |  |  |  |  |  |  |  |  |  |
North Carolina DOR | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustments |  |  |  | $ (17) |  |  |  |  |  |  |  |  |
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 | $ 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) |  |  |  |  |  |  |  |  |  |
Generating facilities planned for retirement |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity (in MW) | MW |  |  |  |  |  |  |  |  |  |  | 5,002 |  |
Generating facilities planned for retirement | Asheville Plant | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity (in MW) | MW |  |  |  |  |  |  |  |  |  |  | 376 |  |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  | $ 214 | $ 327 |

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- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
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- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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