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Regulatory Matters (Duke Energy Indiana Narrative) (Details)					1 Months Ended	12 Months Ended
	Feb. 13, 2025 USD ($) MW	Jan. 29, 2025 USD ($)	Apr. 04, 2024 USD ($)	Jun. 29, 2020 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 20, 2023	Jun. 30, 2023 USD ($)	Feb. 03, 2023 USD ($)	Jun. 15, 2022 USD ($)	Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges								$ 38,000,000	$ 85,000,000	$ 434,000,000
Operating Revenues								30,357,000,000	29,060,000,000	28,768,000,000
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges								0	0	388,000,000
Operating Revenues								$ 3,040,000,000	3,399,000,000	$ 3,922,000,000
Duke Energy Indiana | Indiana Rate Case 2019 | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
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
Duke Energy Indiana | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)			$ 492,000,000
Requested rate increase (decrease), net of tax (as a percent)			16.20%
Requested return on equity (as a percent)			10.50%
Future investments in new cost			$ 1,600,000,000
Equity ratio (as a percent)			53.00%
Accumulated other comprehensive loss (income)					$ 29,000,000
Duke Energy Indiana | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended, amount		$ 385,000,000
Approved rate increase (decrease) amount by state commission		$ 296,000,000
Approved return on equity (as a percent)		9.75%
Equity ratio (as a percent)		53.00%
Duke Energy Indiana | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), net of tax (as a percent)						4.50%	11.70%
Duke Energy Indiana | Cayuga Combined Cycle CPCN | Indiana Utility Regulatory Commission | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), net of tax (as a percent)	5.40%
Winter rating, combustion turbines | MW	471
Estimated cost of generation facilities to be built	$ 2,970,000,000
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Gas-Fired | Indiana Utility Regulatory Commission | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Winter rating, combustion turbines | MW	1,476
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Coal-Fired | Indiana Utility Regulatory Commission | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Winter rating, combustion turbines | MW	1,005

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-Name Accounting Standards Codification
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