EFFECTS OF REGULATION - Regulatory Asset, Early Retirement (Details) - Generating Units Probable of Abandonment $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)
Northeastern Plant, Unit 3 \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Public Utilities, General Disclosures [Line Items]
Net Book Value	$ 101.7
Accelerated Depreciation Regulatory Asset	189.0
Cost of Removal Regulatory Liability	21.0
Annual Depreciation	16.2
Welsh Plant, Units 1 and 3 \| SOUTHWESTERN ELECTRIC POWER COMPANY
Public Utilities, General Disclosures [Line Items]
Net Book Value	324.3
Accelerated Depreciation Regulatory Asset	168.6
Cost of Removal Regulatory Liability	57.6
Annual Depreciation	$ 43.6

The amount of accelerated depreciation as a regulatory asset for plants to be retired.

No definition available.

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Period Type:	instant

- Definition

The regulatory liability recorded for cost of removal.

+ References

No definition available.

+ Details

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

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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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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