Jointly Owned Utility Plant, Plant Capacity

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- Definition

Jointly Owned Utility Plant, Proportionate Energy And Capacity Share

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No definition available.

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- Definition

Jointly Owned Utility Plant, Proportionate Ownership Share Requested To Be Transferred

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No definition available.

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- Definition

Public Utilities, Approve Rate Increase (Decrease) In FERC Transmission Costs

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No definition available.

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- Definition

Public Utilities, Approved Annual Revenue Requirement Increase (Decrease), Amount

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No definition available.

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- Definition

Public Utilities, Approved In Incentive And Other Compensation

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No definition available.

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- Definition

Public Utilities, Approved Rate Increase (Decrease) In New Generation Rider, Amount

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No definition available.

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- Definition

Public Utilities, Approved Retail Rate Increase (Decrease), Amount

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No definition available.

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- Definition

Public Utilities, First Year Revenue Requirement

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No definition available.

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- Definition

Public Utilities, Previously Incurred And Capitalized Costs Required To Be Reclassified As A Regulatory Asset

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No definition available.

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- Definition

Public Utilities, Requested Deferred Costs, Maximum, Thereafter

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No definition available.

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- Definition

Public Utilities, Requested Deferred Costs, Maximum, Year One

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No definition available.

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- Definition

Public Utilities, Requested Rate Increase (Decrease), Amount Related To Depreciation Rates

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No definition available.

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- Definition

Public Utilities, Requested Rate Increase (Decrease), Amount Related To Load Loss

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No definition available.

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- Definition

Public Utilities, Requested Rate Increase (Decrease) In PJM Transmission Costs

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No definition available.

+ Details

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- Definition

Public Utilities, Requested Retail Rate Increase (Decrease), Amount

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Requested Settlement Of Revenue Year One Increase (Decrease), Amount

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Requested Settlement Of Revenue Year Two Increase (Decrease), Amount

+ References

No definition available.

+ Details

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- Definition

Regulatory Asset, Recovery Period

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No definition available.

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- Definition

Regulatory Assets, Estimated Cost to be Recovered

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No definition available.

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- Definition

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

+ Details

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

Percentage of public utility's approved return on equity.

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No definition available.

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- Definition

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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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

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RATE MATTERS - KPCo Rate Matters (Details) $ in Millions	1 Months Ended
RATE MATTERS - KPCo Rate Matters (Details) $ in Millions	Apr. 30, 2026 USD ($)	Feb. 28, 2026 USD ($)	Jan. 31, 2026 USD ($)	Aug. 31, 2025 USD ($)	Jun. 30, 2026 MW	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jul. 31, 2021
KPCo \| 2025 Kentucky Base Rate Case
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)			$ 59	$ 96
Requested return on equity			9.80%	10.00%
Requested debt capital structure			53.90%	53.90%
Requested equity capital structure			46.10%	46.10%
Increase in PJM transmission costs				$ 10
Increase due to load loss				9
Requested rate increase related to depreciation rates				6
Annual increase in Kentucky retail rates			$ 77
Requested retail rate increase (decrease), amount			$ 18
Approved return on equity		9.75%	9.70%
Settlement revenue requirement rate decrease year one			$ 25
Settlement revenue requirement rate decrease year two			15
Requested deferred costs, maximum, year one			45
Requested deferred costs, maximum, year two			$ 52
Approved retail rate increase, amount		$ 55
Approved annual base rate increase		36
Increase in new generation rider		19
Annual revenue increase (decrease), amount		22
Reduction related to FERC transmission expense		10
Reduction in incentive and other compensation		$ 9
Regulatory asset, recovery period		30 years
KPCo \| 2025 Kentucky Base Rate Case \| January 2018 through May 2025
Public Utilities, General Disclosures [Line Items]
Previously incurred and capitalized costs required to be reclassified as a regulatory asset		$ 47
KPCo \| 2025 Kentucky Base Rate Case \| June 2025 through February 2026
Public Utilities, General Disclosures [Line Items]
Previously incurred and capitalized costs required to be reclassified as a regulatory asset	$ 18
SWEPCo \| Mitchell Plant ELG investments
Public Utilities, General Disclosures [Line Items]
Ownership percentage selling								100.00%
Mitchell Plant
Public Utilities, General Disclosures [Line Items]
Jointly owned utility plant, plant capacity \| MW					1,560
Mitchell Plant \| KPCo
Public Utilities, General Disclosures [Line Items]
Jointly owned utility plant, percentage of ownership share					50.00%
Proportionate energy and capacity share							50.00%
Jointly owned utility plant, gross ownership amount of plant in service						$ 520
Requested annual base rate increase (decrease)				$ 20
Mitchell Plant \| SWEPCo
Public Utilities, General Disclosures [Line Items]
Jointly owned utility plant, percentage of ownership share					50.00%
Mitchell Plant ELG investments \| KPCo
Public Utilities, General Disclosures [Line Items]
Jointly owned utility plant, percentage of ownership share								50.00%
Estimated cost to be recovered							$ 78
Mitchell Plant ELG investments \| SWEPCo
Public Utilities, General Disclosures [Line Items]
Proportionate ownership share requested to be transferred							50.00%
Mitchell Plant Non-ELG Capital Investments \| KPCo
Public Utilities, General Disclosures [Line Items]
Estimated cost to be recovered							$ 60
Mitchell Plant Non-ELG Capital Investments \| SWEPCo
Public Utilities, General Disclosures [Line Items]
Jointly owned utility plant, percentage of ownership share								50.00%
Proportionate ownership share requested to be transferred							50.00%