Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		9 Months Ended
Income Taxes (Effective Tax Rates) (Details)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Line Items]
Effective tax rate	10.80%	11.20%	11.20%	12.50%
Duke Energy Carolinas
Income Tax Disclosure [Line Items]
Effective tax rate	6.90%	7.70%	7.80%	9.80%
Progress Energy
Income Tax Disclosure [Line Items]
Effective tax rate	15.90%	16.10%	15.90%	16.40%
Duke Energy Progress
Income Tax Disclosure [Line Items]
Effective tax rate	13.10%	12.90%	13.40%	14.10%
Duke Energy Florida
Income Tax Disclosure [Line Items]
Effective tax rate	19.50%	20.50%	19.40%	19.90%
Duke Energy Ohio
Income Tax Disclosure [Line Items]
Effective tax rate	14.30%	11.90%	16.30%	15.80%
Duke Energy Indiana
Income Tax Disclosure [Line Items]
Effective tax rate	12.60%	15.70%	12.80%	16.30%
Piedmont
Income Tax Disclosure [Line Items]
Effective tax rate	24.00%	29.40%	18.70%	18.40%