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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, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 20, 2023 | Feb. 03, 2023 | Jun. 15, 2022 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 | $ 434,000,000 | $ 353,000,000 |  |  |  |
Operating Revenues |  |  |  | $ 7,212,000,000 | $ 7,994,000,000 | $ 6,578,000,000 | $ 7,276,000,000 | $ 7,351,000,000 | $ 7,842,000,000 | $ 6,564,000,000 | $ 7,011,000,000 | 29,060,000,000 | 28,768,000,000 | 24,621,000,000 |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | 388,000,000 | 9,000,000 |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | $ 3,399,000,000 | 3,922,000,000 | $ 3,174,000,000 |  |  |  |
Duke Energy Indiana | Indiana Rate Case 2019 | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 395,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) |  | 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
Public utilities, disclosure of rate matters, reduction of rate base | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step one estimated percentage (as a percent) | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step two estimated (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | 211,000,000 |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |
Refunds to customers |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  | $ 70,000,000 |  |
Duke Energy Indiana | Indiana Coal Ash Recovery | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |
Simple interest of refunds (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.71% |  |  |
Duke Energy Indiana | TDSIG 2.0 | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future investments in new cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |

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