Approved Rate Increase (Decrease) One Time Waiver, Amount

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- Definition

Distribution Battery Energy Storage System Capacity

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- Definition

Estimated Capital Cost Excluding AFUDC

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- Definition

Requested Rider Revenue Increase

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- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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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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Percentage of public utility's requested debt to capital, including debt and equity.

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Percentage of public utility's requested equity to capital, including debt and equity.

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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's amended requested rate increase (decrease) with regulatory agency.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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- Definition

The amount of regulated power revenues recognized during the period.

+ References

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of 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 (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions							1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 27, 2020 USD ($)	Jan. 31, 2020 USD ($)	Sep. 03, 2019 USD ($) MW	Apr. 13, 2018 USD ($)	Sep. 27, 2017 USD ($)	Sep. 26, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Jul. 12, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulated operating revenue, electric, non-nuclear									$ 5,124	$ 5,285
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulated operating revenue, electric, non-nuclear									346	$ 355
Ohio Base Rate Case 2017 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 15
Requested return on equity, percent							10.40%
Requested rate increase (decrease), amended amount				$ (19)
Requested rate increase (decrease) amended, percentage				9.84%
Public utilities, requested equity capital structure, percentage				50.75%
Public utilities, requested debt capital structure, percentage				49.25%
Approved rate increase (decrease), amount				$ (20)
Energy Efficiency Cost Recovery \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulated operating revenue, electric, non-nuclear								$ 20
MGP Cost Recovery - 2009 Through 2012 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets									55
MGP Cost Recovery - 2013 Through 2017 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 26
MGP Cost Recovery - 2018 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets									39				$ 20
Duke Energy Kentucky Electric base rate case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 46
Requested rate increase (decrease), amended amount		$ 44
Requested rate increase, percentage			12.50%
Distribution battery energy storage system (in MW) \| MW			3.4
Approved return on equity percentage	9.25%
Duke Energy Kentucky Electric base rate case, Kentucky Attorney General \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 26
Minimum \| Ohio Base Rate Case 2017 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ (18)
Requested return on equity, percent						9.22%
Minimum \| Natural Gas Pipeline extension \| OPSB \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC									163
Maximum \| Ohio Base Rate Case 2017 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ (29)
Requested return on equity, percent						10.24%
Requested Rider Revenue Increase				$ 10
Maximum \| Energy Efficiency Cost Recovery \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount					$ 38
Approved rate increase (decrease), one-time waiver amount											$ 56
Maximum \| Natural Gas Pipeline extension \| OPSB \| 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 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 12
MGP Costs - regulatory disallowance \| MGP Cost Recovery - 2018 \| PUCO \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets												$ 11
Subsequent event \| Duke Energy Kentucky Electric base rate case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount	$ 24