COMPREHENSIVE INCOME (Tables)

3 Months Ended

Mar. 31, 2026

Stockholders' Equity Note [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component

The following tables provide AEP’s components of changes in AOCI and details of reclassifications from AOCI.  The amortization of pension and OPEB AOCI components are included in the computation of net periodic pension and OPEB costs. See Note 7 - Benefit Plans for additional information.

	Cash Flow Hedges				Pension
Three Months Ended March 31, 2026	Commodity		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2025	$	78	$	(1)	$	(41)	$	36
Change in Fair Value Recognized in AOCI, Net of Tax	25		—		—		25
Amount of (Gain) Loss Reclassified from AOCI
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)	(50)		—		—		(50)
Amortization of Actuarial (Gains) Losses	—		—		1		1
Reclassifications from AOCI, before Income Tax Expense	(50)		—		1		(49)
Income Tax Expense	(10)		—		—		(10)
Reclassifications from AOCI, Net of Income Tax Expense	(40)		—		1		(39)
Net Current Period Other Comprehensive Income (Loss)	(15)		—		1		(14)
Balance in AOCI as of March 31, 2026	$	63	$	(1)	$	(40)	$	22

	Cash Flow Hedges				Pension
Three Months Ended March 31, 2025	Commodity		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2024	$	99	$	3	$	(105)	$	(3)
Change in Fair Value Recognized in AOCI, Net of Tax	38		(1)		—		37
Amount of (Gain) Loss Reclassified from AOCI
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)	(17)		—		—		(17)
Interest Expense (a)	—		(1)		—		(1)
Amortization of Actuarial (Gains) Losses	—		—		1		1
Reclassifications from AOCI, before Income Tax Expense	(17)		(1)		1		(17)
Income Tax Expense	(4)		—		—		(4)
Reclassifications from AOCI, Net of Income Tax Expense	(13)		(1)		1		(13)
Net Current Period Other Comprehensive Income (Loss)	25		(2)		1		24
Balance in AOCI as of March 31, 2025	$	124	$	1	$	(104)	$	21

(a)Amounts reclassified to the referenced line item on the statements of income.