CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - APCo (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flow Hedges, Tax	$ 1.3	$ (33.8)	$ 21.6
Amortization of Pension and OPEB Deferred Costs, Tax	(0.7)	(3.4)	(2.8)
Pension and OPEB Funded Status, Tax	10.9	(4.3)	(41.3)
APPALACHIAN POWER COMPANY
Cash Flow Hedges, Tax	(0.2)	(0.2)	(0.2)
Amortization of Pension and OPEB Deferred Costs, Tax	(0.3)	(0.8)	(1.1)
Pension and OPEB Funded Status, Tax	$ 4.5	$ 1.3	$ (6.4)

Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

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- Definition

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

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