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Regulatory Matters (Duke Energy Indiana Narrative) (Details)				1 Months Ended	12 Months Ended
	Nov. 25, 2025	Feb. 13, 2025 USD ($) MW	Jan. 29, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Apr. 04, 2024 USD ($)	Sep. 20, 2023	Jun. 15, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					$ (4,000,000)	$ 38,000,000	$ 85,000,000
Operating Revenues					32,237,000,000	30,357,000,000	29,060,000,000
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges							0
Operating Revenues					$ 3,544,000,000	$ 3,040,000,000	$ 3,399,000,000
Duke Energy Indiana | Indiana Coal Ash Recovery | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
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), 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%
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 | Cayuga Combined Cycle CPCN | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), net of tax (as a percent)	5.60%
Winter rating, combustion turbines | MW		471
Estimated cost of generation facilities to be built		$ 3,300,000,000
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Gas-Fired | Indiana Utility Regulatory Commission
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
Public Utilities, General Disclosures [Line Items]
Winter rating, combustion turbines | MW		1,005

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