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Regulatory Matters (Duke Energy Indiana Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 15, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 7,351,000,000 | $ 7,842,000,000 | $ 6,564,000,000 | $ 7,011,000,000 | $ 6,117,000,000 | $ 6,834,000,000 | $ 5,638,000,000 | $ 6,032,000,000 | $ 28,768,000,000 | $ 24,621,000,000 | $ 23,366,000,000 |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 434,000,000 | 353,000,000 | 978,000,000 |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 3,922,000,000 | 3,174,000,000 | $ 2,795,000,000 |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 388,000,000 | 9,000,000 |  |
Duke Energy Indiana | Indiana Utility Regulatory Commission | Indiana Rate Case 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 395,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percentage, net of tax |  | 15.60% |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  | $ 396,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 146,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of rate matters, rate base |  |  |  |  |  |  |  | $ 10,200,000,000 |  |  |  |  | $ 10,200,000,000 |  |
Public utilities, disclosure of rate matters, rate base reduction due to depreciation methodology, percent | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, disclosure of rate matters, rate base reduction due to approved return on equity, percent | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage | 10.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, disclosure of rate matters, rate base reduction due to earnings adjustments, percent | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, disclosure of rate matters, reduction of rate base | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step two estimated (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step one estimated percentage | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 211,000,000 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |
Duke Energy Indiana | Indiana Utility Regulatory Commission | TDSIG 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future investments in new cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Duke Energy Indiana | Indiana Utility Regulatory Commission | Indiana Coal Ash Recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |

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