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Regulatory Matters (Duke Energy Carolinas Narrative) (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Sep. 27, 2021 contention | Jul. 28, 2021 | Jun. 07, 2021 | Jun. 06, 2021 | May 21, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2019 USD ($) | May 21, 2019 USD ($) | Nov. 08, 2018 USD ($) | Feb. 28, 2018 | Aug. 25, 2017 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 14,637 | $ 14,062 |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 356 | 984 | $ (8)
Other income and expenses, net |  |  |  |  |  |  |  |  |  |  |  | 643 | 453 | 430
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 213 | 1,102 |
AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 3,408 | 3,408 |
Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 3,479 | 3,469 |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 227 | 476 | 17
Other income and expenses, net |  |  |  |  |  |  |  |  |  |  |  | 270 | 177 | $ 151
Duke Energy Carolinas | Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 22 | 205 |
Duke Energy Carolinas | AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 1,227 | $ 1,414 |
Duke Energy Carolinas | NCUC | 2017 North Carolina Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |
Approved capital structure, percentage |  |  |  |  |  | 52.00% |  |  |  |  |  |  |  |
Approved debt structure, percentage |  |  |  |  |  | 48.00% |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  | $ 33 |  |  |  |  |  |  |  |  |
Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | Grid Improvement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 800 |  |  |  |  |  |  |  |
Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 213 |  |  |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Deferred project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 125 |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 96 |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Denied recovery costs |  |  |  |  |  |  |  | $ 115 |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 160 |  |
Other income and expenses, net |  |  |  |  |  |  |  |  |  |  |  | $ 31 |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - Unprotected EDIT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - deferred revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | State | North Carolina DOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Approved decrease through EDIT Rider |  |  |  |  |  |  |  | $ 17 |  |  |  |  |  |
Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comment period |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions | contention | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal | Oconee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Operating license |  |  | 80 years | 60 years |  |  |  |  |  |  |  |  |  |

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