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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) $ in Millions		1 Months Ended
	Mar. 25, 2019 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2019 USD ($)	Apr. 02, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 19, 2019 USD ($)	Nov. 22, 2019 USD ($)	Oct. 31, 2018 customer
Hurricane Michael storm damage \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Customers experiencing outages \| customer									72,000
Estimated storm costs - capital and operation maintenance					$ 311
Amount of recovery costs sought								$ 191
Property, plant and equipment, net					106	$ 107
Hurricane Dorian storm damage \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance					147	167	$ 169
Noncurrent assets \| Hurricane Michael storm damage \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance					$ 205	$ 204
Hamilton Project \| 2017 Second Revised and Restated Stipulation and Settlement Agreement \| FPSC \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount			$ 15
Trenton Generation Project \| 2017 Second Revised and Restated Stipulation and Settlement Agreement \| FPSC \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount	$ 13
Lake Placid Generation Project \| 2017 Second Revised and Restated Stipulation and Settlement Agreement \| FPSC \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount	8
DeBary Solar Project \| 2017 Second Revised and Restated Stipulation and Settlement Agreement \| FPSC \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 11
Subsequent event \| FPSC
Public Utilities, General Disclosures [Line Items]
Accelerated fuel cost refund				$ 78
Subsequent event \| Columbia Project \| 2017 Second Revised and Restated Stipulation and Settlement Agreement \| FPSC \| Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount		$ 14