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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2020
Segment Reporting Information [Line Items]  
Reportable Segment Information
Three Months Ended September 30, 2020
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,400.1 $1,124.1 $73.4 $464.8 $4.0 $— $4,066.4 
Other Operating Segments
34.7 41.2 244.5 25.2 28.6 (374.2)— 
Total Revenues$2,434.8 $1,165.3 $317.9 $490.0 $32.6 $(374.2)$4,066.4 
Net Income (Loss)
$394.2 $147.4 $139.3 $114.6 $(47.3)$— $748.2 
Three Months Ended September 30, 2019
 Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,598.9 $1,147.3 $65.5 $501.2 $2.1 $— $4,315.0 
Other Operating Segments
46.6 39.3 207.5 32.5 22.3 (348.2)— 
Total Revenues$2,645.5 $1,186.6 $273.0 $533.7 $24.4 $(348.2)$4,315.0 
Net Income (Loss)
$438.4 $133.7 $127.0 $88.7 $(53.9)$— $733.9 
Nine Months Ended September 30, 2020
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers
$6,655.4 $3,208.7 $215.7 $1,223.4 $4.7 $— $11,307.9 
Other Operating Segments
98.1 98.0 662.1 82.1 67.3 (1,007.6)— 
Total Revenues$6,753.5 $3,306.7 $877.8 $1,305.5 $72.0 $(1,007.6)$11,307.9 
Net Income (Loss)
$896.8 $403.1 $373.1 $203.6 $(114.6)$— $1,762.0 
Nine Months Ended September 30, 2019
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers
$7,087.6 $3,328.7 $196.5 $1,323.8 $8.8 $— $11,945.4 
Other Operating Segments
85.0 125.6 611.8 104.4 64.9 (991.7)— 
Total Revenues$7,172.6 $3,454.3 $808.3 $1,428.2 $73.7 $(991.7)$11,945.4 
Net Income (Loss)
$920.8 $421.6 $407.6 $133.1 $(116.0)$— $1,767.1 
September 30, 2020
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Property, Plant and Equipment
$48,533.5 $20,738.7 $11,377.1 $1,854.4 $399.3 $— $82,903.0 
Accumulated Depreciation and Amortization
15,340.1 3,891.6 553.1 150.1 181.7 — 20,116.6 
Total Property Plant and Equipment - Net
$33,193.4 $16,847.1 $10,824.0 $1,704.3 $217.6 $— $62,786.4 
Total Assets$42,110.4 $19,250.3 $12,035.8 $3,368.6 $5,718.9 (b)$(3,794.7)(c)$78,689.3 
Long-term Debt Due Within One Year:
Nonaffiliated1,313.7 87.8 2.3 — 507.8 (d)— 1,911.6 
Long-term Debt:
Affiliated59.0 — — — — (59.0)— 
Nonaffiliated12,048.7 7,196.7 4,123.2 — 4,786.9 (d)— 28,155.5 
Total Long-term Debt
$13,421.4 $7,284.5 $4,125.5 $— $5,294.7 $(59.0)$30,067.1 
December 31, 2019
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling
Adjustments		Consolidated
 (in millions)
Total Property, Plant and Equipment
$47,323.7 $19,773.3 $10,334.0 $1,650.8 $418.4 $(354.5)(e)$79,145.7 
Accumulated Depreciation and Amortization
14,580.4 3,911.2 418.9 99.0 184.5 (186.4)(e)19,007.6 
Total Property Plant and Equipment - Net
$32,743.3 $15,862.1 $9,915.1 $1,551.8 $233.9 $(168.1)(e)$60,138.1 
Total Assets$41,228.8 $18,757.5 $11,143.5 $3,123.8 $5,440.0 (b)$(3,801.3)(c) (e)$75,892.3 
Long-term Debt Due Within One Year:
Affiliated$20.0 $— $— $— $— $(20.0)$— 
Nonaffiliated704.7 392.2 — — 501.8 (d)— 1,598.7 
Long-term Debt:
Affiliated39.0 — — — — (39.0)— 
Nonaffiliated12,162.0 6,248.1 3,593.8 — 3,122.9 (d)— 25,126.8 
Total Long-term Debt
$12,925.7 $6,640.3 $3,593.8 $— $3,624.7 $(59.0)$26,725.5 

(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)Amounts are inclusive of the impact of fair value hedge accounting. See “Accounting for Fair Value Hedging Strategies” section of Note 10 for additional information.
(e)Includes eliminations due to an intercompany finance lease.
Three Months Ended September 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$62.9 $— $— $62.9 
Sales to AEP Affiliates
241.2 — — 241.2 
Total Revenues$304.1 $— $— $304.1 
Interest Income
$— $38.4 $(38.2)(a)$0.2 
Interest Expense
32.7 38.2 (38.2)(a)32.7 
Income Tax Expense31.7 — — 31.7 
Net Income$117.5 $0.1 (b)$— $117.6 
Three Months Ended September 30, 2019
State Transcos AEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$54.0 $— $— $54.0 
Sales to AEP Affiliates
205.7 — — 205.7 
Total Revenues$259.7 $— $— $259.7 
Interest Income
$0.4 $32.3 $(31.9)(a)$0.8 
Interest Expense
26.4 31.9 (31.9)(a)26.4 
Income Tax Expense 30.0 0.1 — 30.1 
Net Income$107.3 $0.3 (b)$— $107.6 
Nine Months Ended September 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$184.6 $— $— $184.6 
Sales to AEP Affiliates652.6— — 652.6 
Other Revenues0.6 — — 0.6 
Total Revenues$837.8 $— $— $837.8 
Interest Income$0.9 $111.3 $(109.9)(a)$2.3 
Interest Expense95.1 109.9 (109.9)(a)95.1 
Income Tax Expense82.7 0.1 — 82.8 
Net Income$308.0 $1.1 (b)$— $309.1 
Nine Months Ended September 30, 2019
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$162.1 $— $— $162.1 
Sales to AEP Affiliates608.0— — 608.0 
Total Revenues$770.1 $— $— $770.1 
Interest Income$0.8 $89.7 $(88.4)(a)$2.1 
Interest Expense69.588.4(88.4)(a)69.5
Income Tax Expense90.5 0.2 — 90.7 
Net Income$347.1 $0.8 (b)$— $347.9 
September 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Transmission Property$10,921.3 $— $— $10,921.3 
Accumulated Depreciation and Amortization531.8 — — 531.8 
Total Transmission Property – Net$10,389.5 $— $— $10,389.5 
Notes Receivable - Affiliated$— $3,947.9 $(3,947.9)(c)$— 
Total Assets$10,641.8 $4,104.1 (d)$(4,047.2)(e)$10,698.7 
Total Long-term Debt$3,990.0 $3,947.9 $(3,990.0)(c)$3,947.9 
December 31, 2019
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Transmission Property
$9,893.2 $— $— $9,893.2 
Accumulated Depreciation and Amortization
402.3 — — 402.3 
Total Transmission Property – Net
$9,490.9 $— $— $9,490.9 
Notes Receivable - Affiliated$— $3,427.3 $(3,427.3)(c)$— 
Total Assets$9,865.0 $3,519.1 (d)$(3,493.3)(e)$9,890.8 
Total Long-term Debt
$3,465.0 $3,427.3 $(3,465.0)(c)$3,427.3 

(a)Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
(b)Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.
(c)Elimination of intercompany debt.
(d)Includes the elimination of AEPTCo Parent’s investments in State Transcos.
(e)Primarily relates to the elimination of Notes Receivable from the State Transcos.
 [1]
[1] Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.