Business Segments (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting Information [Line Items]

Reportable Segment Information

	Three Months Ended March 31, 2024
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	2,901.2	$	1,483.2	$	110.5	$	515.9	$	14.9	$	—		$	5,025.7
Other Operating Segments	46.7		7.0		386.8		47.6		37.9		(526.0)		(b)	—
Total Revenues	$	2,947.9	$	1,490.2	$	497.3	$	563.5	$	52.8	$	(526.0)		$	5,025.7
Net Income (Loss)	$	562.3	$	150.3	$	209.8	$	137.6	$	(54.3)	$	—		$	1,005.7
	Three Months Ended March 31, 2023
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	2,816.3	$	1,455.3	$	90.1	$	326.9	$	2.3	$	—		$	4,690.9
Other Operating Segments	41.5		8.9		365.4		0.1		27.8		(443.7)		(b)	—
Total Revenues	$	2,857.8	$	1,464.2	$	455.5	$	327.0	$	30.1	$	(443.7)		$	4,690.9
Net Income (Loss)	$	262.2	$	125.7	$	182.4	$	(156.4)	$	(13.5)	$	—		$	400.4

	March 31, 2024
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Total Assets	$	52,379.2	$	25,283.4	$	17,067.4	$	2,257.5	$	5,164.3	(c)	$	(4,407.2)	(d)	$	97,744.6

	December 31, 2023
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Total Assets	$	51,802.1	$	24,838.4	$	16,575.6	$	2,598.5	$	5,194.0	(c)	$	(4,324.6)	(d)	$	96,684.0

(a)Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.

(b)Represents inter-segment revenues.

(c)Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.

(d)Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.

	Three Months Ended March 31, 2024
	State Transcos		AEPTCo Parent			Reconciling Adjustments		AEPTCo Consolidated
	(in millions)
Revenues from:
External Customers	$	97.0	$	—		$	—	$	97.0
Sales to AEP Affiliates	383.4		—			—		383.4
Other Revenues	2.4		—			—		2.4
Total Revenues	$	482.8	$	—		$	—	$	482.8
Net Income (Loss)	$	181.7	$	(0.5)	(a)	$	—	$	181.2
	Three Months Ended March 31, 2023
	State Transcos		AEPTCo Parent			Reconciling Adjustments		AEPTCo Consolidated
	(in millions)
Revenues from:
External Customers	$	89.0	$	—		$	—	$	89.0
Sales to AEP Affiliates	352.6		—			—		352.6
Total Revenues	$	441.6	$	—		$	—	$	441.6
Net Income	$	161.6	$	1.1	(a)	$	—	$	162.7

	March 31, 2024
	State Transcos		AEPTCo Parent			Reconciling Adjustments			AEPTCo Consolidated
	(in millions)
Total Assets	$	15,609.4	$	5,949.9	(b)	$	(6,000.3)	(c)	$	15,559.0
	December 31, 2023
	State Transcos		AEPTCo Parent			Reconciling Adjustments			AEPTCo Consolidated
	(in millions)
Total Assets	$	15,120.6	$	5,486.6	(b)	$	(5,534.7)	(c)	$	15,072.5

(a)Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.

(b)Primarily relates to Notes Receivable from the State Transcos.

(c)Primarily relates to the elimination of Notes Receivable from the State Transcos.