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Business Segments (Tables)
 3 Months Ended
Mar. 31, 2022
Segment Reporting Information [Line Items]  
Reportable Segment Information
Three Months Ended March 31, 2022
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,646.8 $1,242.2 $83.4 $609.5 $10.7 $— $4,592.6 
Other Operating Segments
40.6 4.6 328.0 9.8 9.2 (392.2)— 
Total Revenues$2,687.4 $1,246.8 $411.4 $619.3 $19.9 $(392.2)$4,592.6 
Net Income (Loss)
$299.2 $152.8 $173.7 $116.0 $(23.6)$— $718.1 
Three Months Ended March 31, 2021
 Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,504.5 $1,082.3 $87.9 $601.7 $4.7 $— $4,281.1 
Other Operating Segments
32.8 5.8 289.1 32.5 8.2 (368.4)— 
Total Revenues$2,537.3 $1,088.1 $377.0 $634.2 $12.9 $(368.4)$4,281.1 
Net Income (Loss)
$271.4 $114.4 $173.2 $38.2 $(18.4)$— $578.8 

March 31, 2022
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Assets (d)$48,073.4 $21,413.9 $14,083.9 $4,790.7 $6,743.6 (b)$(5,274.1)(c)$89,831.4 
December 31, 2021
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Assets (d)$46,974.2 $21,120.2 $13,873.3 $4,263.6 $5,846.5 (b)$(4,409.1)(c) $87,668.7 

(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.
(d)Amount includes Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 6 for additional information.
Three Months Ended March 31, 2022
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$75.7 $— $— $75.7 
Sales to AEP Affiliates
324.7 — — 324.7 
Total Revenues$400.4 $— $— $400.4 
Net Income$155.4 $— (a)$— $155.4 
Three Months Ended March 31, 2021
State Transcos AEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$76.0 $— $— $76.0 
Sales to AEP Affiliates
285.6 — — 285.6 
Other Revenues
0.1 — — 0.1 
Total Revenues$361.7 $— $— $361.7 
Net Income$151.7 $— (a)$— $151.7 
March 31, 2022
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets (d)$12,768.6 $4,396.3 (b)$(4,450.5)(c)$12,714.4 
December 31, 2021
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Assets (d)$12,564.3 $4,389.5 (b)$(4,429.4)(c)$12,524.4 

(a)Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.
(b)Includes the elimination of AEPTCo Parent’s investments in State Transcos.
(c)Primarily relates to the elimination of Notes Receivable from the State Transcos.
(d)Amount includes Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 6 for additional information.