Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) outage in Millions, customer in Millions										1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 15, 2024 solar_projects	Apr. 02, 2024	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 ($) plant MW	Jan. 31, 2024	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2027 USD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 29, 2023 USD ($)	Aug. 30, 2023 customer	Sep. 28, 2022 outage	Sep. 27, 2022 USD ($)	Apr. 11, 2022 USD ($)
Duke Energy Florida | Solar Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of facilities									$ 1,000,000,000
FPSC | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Number of solar plants | plant									10
Generation capacity (MW) | MW									750
2021 Settlement | FPSC | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount																			$ 49,000,000	$ 67,000,000
Public utilities, approved equity capital structure, percentage (as a percent)								53.00%
Public utilities, basis points, increase, percentage								0.25%
Contract with customer, asset, after allowance for credit loss, noncurrent							$ 154,000,000	$ 173,000,000			$ 157,000,000		$ 157,000,000
Earnings recognized during period											$ 8,000,000	$ 9,000,000	$ 16,000,000	$ 63,000,000
Proceeds from legal settlements							$ 180,000,000
Requested rate increase (decrease), amount					$ (56,000,000)
Future investment in infrastructure								$ 1,000,000,000
2021 Settlement | FPSC | Duke Energy Florida | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Public utilities, basis points, increase, percentage								0.50%
2021 Settlement | FPSC | Duke Energy Florida | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)								8.85%
2021 Settlement | FPSC | Duke Energy Florida | Minimum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)								9.85%
2021 Settlement | FPSC | Duke Energy Florida | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)								10.85%
2021 Settlement | FPSC | Duke Energy Florida | Maximum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)								10.10%
2021 Settlement | FPSC | Duke Energy Florida | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)								9.85%
2021 Settlement | FPSC | Duke Energy Florida | Forecast
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount																		$ 79,000,000
Contract with customer, asset, after allowance for credit loss, noncurrent																		$ 16,000,000
Storm Protection Plan | FPSC | Duke Energy Florida
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
Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Actual storm costs																					$ 431,000,000
Hurricane Ian | FPSC | Duke Energy Florida | Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Number of outages | outage																							1.1
Storm reserves												$ 132,000,000		$ 132,000,000										$ 107,000,000
Interim recovery payments				$ 442,000,000
Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Interim recovery payments			$ 74,000,000
Hurricane Idalia, Retail Portion | FPSC | Duke Energy Florida | Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Interim recovery payments			92,000,000
Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian
Public Utilities, General Disclosures [Line Items]
Interim recovery payments			$ 166,000,000
Number of impacted customers | customer																						0.2
2022 North Carolina Rate Case | FPSC | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease) (as a percent)										4.00%
2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		11.15%
Public utilities, approved equity capital structure, percentage (as a percent)		53.00%
2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount															$ 129,000,000	$ 98,000,000	$ 593,000,000
2024 Florida Rate Case | FPSC | Duke Energy Florida | Subsequent event
Public Utilities, General Disclosures [Line Items]
Number of solar plants | solar_projects	12
2024 Florida Rate Case | FPSC | Duke Energy Florida | Minimum | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	9.30%
2024 Florida Rate Case | FPSC | Duke Energy Florida | Maximum | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	11.30%
2024 Florida Rate Case | FPSC | Duke Energy Florida | Weighted Average | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	10.30%
Public utilities, approved equity capital structure, percentage (as a percent)	53.00%
2024 Florida Rate Case | FPSC | Duke Energy Florida | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount																59,000,000	203,000,000
2024 Florida Rate Case, Solar Facilities | FPSC | Duke Energy Florida | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount															$ 58,000,000	$ 71,000,000	$ 12,000,000