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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2023
Segment Reporting Information [Line Items]  
Reportable Segment Information
Three Months Ended September 30, 2023
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$3,158.1 $1,535.2 $94.0 $527.5 $26.9 $— $5,341.7 
Other Operating Segments
47.3 8.9 382.7 39.2 30.3 (508.4)— 
Total Revenues$3,205.4 $1,544.1 $476.7 $566.7 $57.2 $(508.4)$5,341.7 
Net Income (Loss)
$514.0 $206.0 $203.9 $132.8 $(98.4)$— $958.3 
Three Months Ended September 30, 2022
 Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$3,174.6 $1,525.5 $81.9 $733.1 $11.0 $— $5,526.1 
Other Operating Segments
51.7 4.7 349.0 2.3 17.3 (425.0)— 
Total Revenues$3,226.3 $1,530.2 $430.9 $735.4 $28.3 $(425.0)$5,526.1 
Net Income (Loss)
$476.9 $165.5 $171.4 $96.2 $(226.7)$— $683.3 
Nine Months Ended September 30, 2023
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$8,603.4 $4,321.3 $272.4 $1,172.6 $35.4 $— $14,405.1 
Other Operating Segments
134.3 27.2 1,118.4 52.5 83.9 (1,416.3)— 
Total Revenues$8,737.7 $4,348.5 $1,390.8 $1,225.1 $119.3 $(1,416.3)$14,405.1 
Net Income (Loss)
$1,054.6 $508.4 $583.6 $(62.2)$(209.6)$— $1,874.8 
Nine Months Ended September 30, 2022
 Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$8,416.4 $4,064.5 $244.4 $1,997.0 $36.1 $— $14,758.4 
Other Operating Segments
145.8 14.1 976.7 17.3 36.6 (1,190.5)— 
Total Revenues$8,562.2 $4,078.6 $1,221.1 $2,014.3 $72.7 $(1,190.5)$14,758.4 
Net Income (Loss)
$1,079.4 $483.1 $487.8 $278.1 $(406.2)$— $1,922.2 
September 30, 2023
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Assets$50,940.3 $24,327.9 $16,155.0 $2,517.0 $4,567.2 (b)$(3,381.8)(c)$95,125.6 
December 31, 2022
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Assets$49,761.8 $22,920.2 $15,215.8 $4,520.1 $6,768.4 (b)$(5,783.0)(c) $93,403.3 

(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)Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.
(c)Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.
Three Months Ended September 30, 2023
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$92.8 $— $— $92.8 
Sales to AEP Affiliates
369.9 — — 369.9 
Total Revenues$462.7 $— $— $462.7 
Net Income$178.2 $1.0 (a)$— $179.2 
Three Months Ended September 30, 2022
State Transcos AEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$87.2 $— $— $87.2 
Sales to AEP Affiliates
331.3 — — 331.3 
Total Revenues$418.5 $— $— $418.5 
Net Income$152.6 $0.1 (a)$— $152.7 
Nine Months Ended September 30, 2023
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$269.2 $— $— $269.2 
Sales to AEP Affiliates1,080.0 — — 1,080.0 
Total Revenues$1,349.2 $— $— $1,349.2 
Net Income$514.0 $3.6 (a)$— $517.6 
Nine Months Ended September 30, 2022
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$249.5 $— $— $249.5 
Sales to AEP Affiliates933.8 — — 933.8 
Total Revenues$1,183.3 $— $— $1,183.3 
Net Income$426.4 $0.2 (a)$— $426.6 
September 30, 2023
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets$14,760.8 $5,561.2 (b)$(5,610.0)(c)$14,712.0 
December 31, 2022
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets$13,875.6 $4,817.4 (b)$(4,878.8)(c)$13,814.2 

(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.