Regulatory Matters (Duke Energy Florida Narrative) (Details)										12 Months Ended
	Sep. 23, 2024 USD ($)	Jul. 15, 2024 solar_projects	Oct. 16, 2023 USD ($)	Jan. 23, 2023 USD ($)	Oct. 17, 2022 USD ($)	Oct. 04, 2022 USD ($)	Jun. 15, 2022 USD ($)	Jan. 14, 2021 USD ($)	Jul. 01, 2020 USD ($) plant MW	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 15, 2025 USD ($)	Dec. 27, 2024 USD ($)	Aug. 01, 2024 USD ($)	Jul. 31, 2024 USD ($)	Sep. 29, 2023 USD ($)	Aug. 30, 2023 outage	Sep. 28, 2022 outage	Sep. 27, 2022 USD ($)	Apr. 11, 2022 USD ($)	May 04, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Other Noncurrent Assets: Regulatory assets												$ 14,254,000,000	$ 13,618,000,000
Capital expenditures												12,263,000,000	12,622,000,000	$ 11,419,000,000
Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Actual storm costs																			$ 431,000,000
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Other Noncurrent Assets: Regulatory assets												2,064,000,000	1,883,000,000
Capital expenditures												2,449,000,000	2,529,000,000	2,247,000,000
Duke Energy Florida | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Other Noncurrent Assets: Regulatory assets												936,000,000
Capital expenditures												69,000,000
Duke Energy Florida | Solar Plant
Public Utilities, General Disclosures [Line Items]
Estimated cost of generation facilities to be built									$ 1,100,000,000
Duke Energy Florida | FPSC
Public Utilities, General Disclosures [Line Items]
Number of solar plants petition for approval | plant									10
Solar generation capacity plants (in MW) | MW									749
Duke Energy Florida | FPSC | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Number of outages | outage																					1,100,000
Duke Energy Florida | FPSC | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Investment in transmission and distribution															$ 7,000,000,000
Duke Energy Florida | 2021 Settlement | FPSC
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission												79,000,000	49,000,000	$ 67,000,000
Approved capital structure (as a percent)								53.00%
Public utilities, basis points, increase								0.25%
Contract asset, noncurrent							$ 154,000,000	$ 173,000,000				$ 32,000,000	$ 141,000,000											$ 173,000,000
Proceeds from legal settlements							$ 180,000,000
Requested rate increase (decrease)					$ 56,000,000
Future investments in new cost								$ 1,000,000,000
Duke Energy Florida | 2021 Settlement | FPSC | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Public utilities, basis points, increase								0.50%
Duke Energy Florida | 2021 Settlement | FPSC | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)								8.85%
Duke Energy Florida | 2021 Settlement | FPSC | Minimum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)								9.85%
Duke Energy Florida | 2021 Settlement | FPSC | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)								10.85%
Duke Energy Florida | 2021 Settlement | FPSC | Maximum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)								10.10%
Duke Energy Florida | 2021 Settlement | FPSC | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)								9.85%
Duke Energy Florida | Storm Protection Plan | FPSC
Public Utilities, General Disclosures [Line Items]
Investment in transmission and distribution																							$ 7,000,000,000
Cost reduction to transmission loop						$ 80,000,000
Cost reduction period (in years)						10 years
Duke Energy Florida | Hurricane Ian | FPSC | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Storm reserves																$ 1,100,000,000	$ 132,000,000	$ 63,000,000				$ 107,000,000
Interim recovery payments				$ 442,000,000
Duke Energy Florida | Hurricane Idalia | FPSC | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Number of customers impacted | outage																				200,000
Interim recovery payments	$ 98,000,000		$ 166,000,000
Duke Energy Florida | Hurricane Idalia, Retail Portion | FPSC | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Interim recovery payments			92,000,000
Duke Energy Florida | Hurricane Idalia, Projected Costs | FPSC | Natural Disasters and Other Casualty Events
Public Utilities, General Disclosures [Line Items]
Interim recovery payments			$ 74,000,000
Duke Energy Florida | 2024 Florida Rate Case | FPSC
Public Utilities, General Disclosures [Line Items]
Number of solar plants petition for approval | solar_projects		12
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)										$ (59,000,000)	$ (203,000,000)
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)		9.30%
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)		11.30%
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)		10.30%
Approved capital structure (as a percent)		53.00%