Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida			12 Months Ended
	May 04, 2021 USD ($)	Jul. 01, 2020 USD ($) plant MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 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 ($)
FPSC
Public Utilities, General Disclosures [Line Items]
Number of solar plants | plant		10
Generation capacity (MW) | MW		750
2021 Settlement | FPSC
Public Utilities, General Disclosures [Line Items]
Public utilities, approved equity capital structure, percentage	53.00%
Public utilities, approved debt capital structure, percentage	47.00%
Public utilities, basis points, increase, percentage	0.25%
Contract with customer, asset, after allowance for credit loss, noncurrent	$ 173,000,000
Future investment in infrastructure	$ 1,000,000,000
2021 Settlement | FPSC | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Public utilities, basis points, increase, percentage	0.50%
2021 Settlement | FPSC | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	8.85%
2021 Settlement | FPSC | Minimum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	9.85%
2021 Settlement | FPSC | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	10.85%
2021 Settlement | FPSC | Maximum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	10.10%
2021 Settlement | FPSC | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	9.85%
2021 Settlement | FPSC | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved rate increase, amount			$ 79,000,000	$ 49,000,000	$ 67,000,000
Hurricane Michael storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance						$ 80,000,000
Hurricane Michael storm damage | FPSC
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
Requested supplemental true-up								$ 3,000,000
Hurricane Dorian storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance									$ 169,000,000
Actual storm costs - capital and operation maintenance							$ 145,000,000
Solar Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of facilities		$ 1,000,000,000
Estimated cost of facilities period		4 years