Regulatory Matters (Duke Energy Florida Narrative) (Details)			12 Months Ended
	Jan. 14, 2021 USD ($)	Jul. 01, 2020 USD ($) plant MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	May 19, 2020 USD ($)	Dec. 19, 2019 USD ($)	Nov. 22, 2019 USD ($)	Apr. 30, 2019 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 14,637,000,000	$ 14,062,000,000
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Regulatory assets						2,288,000,000	2,064,000,000
Hurricane Dorian Storm Damage | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Estimated storm costs, capital and operation maintenance										$ 169,000,000
FPSC | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Number of solar plants petition for approval | plant		10
Solar generation capacity plants (in MW) | MW		750
FPSC | 2021 Settlement | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved capital structure, percentage	53.00%
Approved debt structure, percentage	47.00%
Public utilities, basis points, increase	0.25%
Contract asset, noncurrent	$ 173,000,000
Future investments in new cost	$ 1,000,000,000
FPSC | 2021 Settlement | Duke Energy Florida | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission			$ 79,000,000	$ 49,000,000	$ 67,000,000
FPSC | 2021 Settlement | Duke Energy Florida | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Public utilities, basis points, increase	0.50%
FPSC | 2021 Settlement | Duke Energy Florida | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity, percentage	8.85%
FPSC | 2021 Settlement | Duke Energy Florida | Minimum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity, percentage	9.85%
FPSC | 2021 Settlement | Duke Energy Florida | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity, percentage	10.85%
FPSC | 2021 Settlement | Duke Energy Florida | Maximum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity, percentage	10.10%
FPSC | 2021 Settlement | Duke Energy Florida | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity, percentage	9.85%
FPSC | Hurricane Michael Storm Damage | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Estimated storm costs, capital and operation maintenance												$ 223,000,000
Amount of recovery costs sought									$ 188,000,000		$ 191,000,000
Storm deferral - requested supplemental true-up									$ 3,000,000
FPSC | Hurricane Dorian Storm Damage | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Storm Costs - Capital and Operation Maintenance								$ 145,000,000
Solar Plant | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Estimated cost of generation facilities to be built		$ 1,000,000,000
Estimated cost of generation facilities to be built, period		3 years
Storm cost deferrals
Public Utilities, General Disclosures [Line Items]
Regulatory assets						213,000,000	1,102,000,000
Storm cost deferrals | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 19,000,000	108,000,000
Storm cost deferrals | Hurricane Michael Storm Damage | Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Regulatory assets							$ 80,000,000