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Percentage of public utility's approved return on equity.

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The amount of regulated power revenues recognized during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions									1 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($)	Sep. 03, 2019 USD ($) MW	Jan. 30, 2019 USD ($)	Aug. 31, 2018 USD ($)	Apr. 13, 2018 USD ($)	Apr. 01, 2018 USD ($)	Sep. 27, 2017 USD ($)	Sep. 26, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 12, 2019 USD ($)	Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulated electric											$ 22,615	$ 22,097	$ 21,177
Regulatory assets											15,018	15,622
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulated electric											1,456	1,450	1,373
Regulatory assets											598	564
Electric Base Rate Case \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)									$ 15
Requested return on equity, percentage									10.40%
Requested rate increase (decrease), amended, amount					$ (19)
Requested capital structure, percentage					50.75%
Approved return on equity, percentage					9.84%
Requested debt structure, percentage					49.25%
Approved rate increase (decrease) amount by state commission						$ (20)
Energy Efficiency Cost Recovery Program \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission													$ 56
Regulated electric										$ 20
MGP Cost Recovery - 2009 Through 2012 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets											55
MGP Cost Recovery - 2013 Through 2017 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets															$ 26
MGP Cost Recovery - 2018 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets												20
Duke Energy Kentucky Gas Base Rate Case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)				$ 11
Requested rate increase (decrease), amended, amount				$ (5)
Approved return on equity, percentage			9.70%
Approved rate increase (decrease) amount by state commission			$ 7
Requested rate increase (decrease), percent				11.10%
Duke Energy Kentucky Electric Base Rate Case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)		$ 46
Requested rate increase (decrease), percent		12.50%
Distribution battery energy storage system (in MW) \| MW		3.4
Duke Energy Kentucky Electric Base Rate Case, Kentucky Attorney General \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)		$ 26
Minimum \| Electric Base Rate Case \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)								$ (18)
Requested return on equity, percentage								9.22%
Minimum \| Natural Gas Pipeline Extension \| Ohio Power Siting Board \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC											163
Maximum \| Electric Base Rate Case \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)								$ (29)
Requested return on equity, percentage								10.24%
Requested rider revenue increase					$ 10
Maximum \| Energy Efficiency Cost Recovery Program \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease) amount by state commission							$ 38
Maximum \| Natural Gas Pipeline Extension \| Ohio Power Siting Board \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC											245
MGP Costs - Regulatory Disallowance \| MGP Cost Recovery - 2013 Through 2017 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets															$ 12
MGP Costs - Regulatory Disallowance \| MGP Cost Recovery - 2018 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 11
RTO Realignment \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets											$ 40	$ 43
Subsequent Event \| Duke Energy Kentucky Electric Base Rate Case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 44