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Regulatory Matters (Duke Energy Progress Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 21, 2021 | Apr. 16, 2021 | Oct. 16, 2020 | Oct. 30, 2019 | Oct. 11, 2019 | May 21, 2019 | Nov. 08, 2018 | Nov. 22, 2017 | Jun. 01, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 4,651 | 4,468 |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 63 | 499 | 12
Other income and expenses, net |  |  |  |  |  |  |  |  |  | 143 | 75 | $ 100
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% |  |  |  |
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 | North Carolina Utilities Commission | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 178 |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 9.60% |  |  |  |  |  |  |  |  |  |
Approved capital structure, percentage |  | 52.00% |  |  |  |  |  |  |  |  |  |
Approved debt structure, percentage |  | 48.00% |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Grid Improvement | 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] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | $ 400 |  |  |  |  |  |  |  |  |  |
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 213 | 1,102 |
Storm cost deferrals | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 170 | 785 |
Storm cost deferrals | 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] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | $ 714 |  |  |  |  |  |  |  |  |  |
AROs – coal ash |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 3,408 | 3,408 |
AROs – coal ash | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 1,389 | $ 1,347 |
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 |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 42 |  |
Other income and expenses, net |  |  |  |  |  |  |  |  |  | $ 6 |  |
Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  | 20 years |  |  |  |  |  |
Asset retirement obligations - Unprotected EDIT | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  | 5 years |  |  |  |  |  |
Asset retirement obligations - deferred revenue | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  | 3 years |  |  |  |  |  |
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 |  |  |  |  |  |

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