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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) $ in Millions				1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 13, 2025 USD ($) MW	Feb. 07, 2025 USD ($)	Jan. 29, 2025 USD ($)	Apr. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2026	Dec. 31, 2025	Sep. 20, 2023	Jun. 15, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Operating Revenues					$ 8,249	$ 7,671
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Operating Revenues					$ 858	$ 759
Indiana Coal Ash Recovery | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Interest rate on refunds (as a percent)									4.71%
TDSIG 2.0 | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Future investment in infrastructure										$ 2,000
2024 Indiana Rate Case | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Future investment in infrastructure				$ 1,600
Requested rate increase (decrease), amount		$ 385	$ 296	$ 492
Requested rate increase, percentage, net of tax				16.20%
Requested return on equity (as a percent)			9.75%	10.50%
Equity ratio (as a percent)			53.00%	53.00%
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase, percentage, net of tax							4.50%	11.70%
Cayuga Combined Cycle CPCN, Gas-Fired | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
New combustion turbines (in megawatts) | MW	1,476
Cayuga Combined Cycle CPCN, Coal-Fired | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
New combustion turbines (in megawatts) | MW	1,005
Cayuga Combined Cycle CPCN | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Requested rate increase, percentage, net of tax	5.40%
New combustion turbines (in megawatts) | MW	471
Estimated cost of facilities	$ 3,000

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