Derivatives and Hedging (Narrative) (Details) $ in Millions	1 Months Ended
Apr. 30, 2020 USD ($)
Not Designated as Hedging Instruments \| Duke Energy Florida \| Equity Securities Contracts
Derivative [Line Items]
Proceeds liquidation of options	$ 7

The cash inflow provided by derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration