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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2020
Segment Reporting Information [Line Items]  
Reportable Segment Information
Three Months Ended June 30, 2020
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,062.3  $1,009.4  $69.2  $350.2  $2.9  $—  $3,494.0  
Other Operating Segments
29.7  25.1  180.5  26.7  16.6  (278.6) —  
Total Revenues$2,092.0  $1,034.5  $249.7  $376.9  $19.5  $(278.6) $3,494.0  
Net Income (Loss)
$256.3  $139.5  $92.2  $58.5  $(32.0) $—  $514.5  
Three Months Ended June 30, 2019
 Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
 (in millions)
Revenues from:      
External Customers
$2,116.4  $1,001.6  $69.8  $382.9  $2.9  $—  $3,573.6  
Other Operating Segments
7.4  44.1  209.1  29.8  20.9  (311.3) —  
Total Revenues$2,123.8  $1,045.7  $278.9  $412.7  $23.8  $(311.3) $3,573.6  
Net Income (Loss)
$178.8  $131.4  $155.4  $5.2  $(11.7) $—  $459.1  
Six Months Ended June 30, 2020
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers
$4,255.3  $2,084.6  $142.3  $758.6  $0.7  $—  $7,241.5  
Other Operating Segments
63.4  56.8  417.6  56.9  38.7  (633.4) —  
Total Revenues$4,318.7  $2,141.4  $559.9  $815.5  $39.4  $(633.4) $7,241.5  
Net Income (Loss)
$502.6  $255.7  $233.8  $89.0  $(67.3) $—  $1,013.8  
Six Months Ended June 30, 2019
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration
&
Marketing		Corporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
Revenues from:
External Customers
$4,488.7  $2,181.4  $131.0  $822.6  $6.7  $—  $7,630.4  
Other Operating Segments
38.4  86.3  404.3  71.9  42.6  (643.5) —  
Total Revenues$4,527.1  $2,267.7  $535.3  $894.5  $49.3  $(643.5) $7,630.4  
Net Income (Loss)
$482.4  $287.9  $280.6  $44.4  $(62.1) $—  $1,033.2  
June 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
$48,233.4  $20,650.2  $10,994.4  $1,772.1  $408.6  $(354.5) (b)$81,704.2  
Accumulated Depreciation and Amortization
15,130.5  4,001.7  508.2  134.7  188.9  (186.6) (b)19,777.4  
Total Property Plant and Equipment - Net
$33,102.9  $16,648.5  $10,486.2  $1,637.4  $219.7  $(167.9) (b)$61,926.8  
Total Assets$41,991.2  $19,209.5  $11,804.0  $3,249.0  $5,897.9  (c)$(4,346.8) (b) (d)$77,804.8  
Long-term Debt Due Within One Year:
Affiliated$20.0  $—  $—  $—  $—  $(20.0) $—  
Nonaffiliated1,390.8  239.2  —  —  507.7  (e)—  2,137.7  
Long-term Debt:
Affiliated39.0  —  —  —  —  (39.0) —  
Nonaffiliated12,007.4  6,552.9  4,121.9  —  3,955.5  (e)—  26,637.7  
Total Long-term Debt
$13,457.2  $6,792.1  $4,121.9  $—  $4,463.2  $(59.0) $28,775.4  
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) (b)$79,145.7  
Accumulated Depreciation and Amortization
14,580.4  3,911.2  418.9  99.0  184.5  (186.4) (b)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) (b)$60,138.1  
Total Assets$41,228.8  $18,757.5  $11,143.5  $3,123.8  $5,440.0  (c)$(3,801.3) (b) (d)$75,892.3  
Long-term Debt Due Within One Year:
Affiliated$20.0  $—  $—  $—  $—  $(20.0) $—  
Nonaffiliated704.7  392.2  —  —  501.8  (e)—  1,598.7  
Long-term Debt:
Affiliated39.0  —  —  —  —  (39.0) —  
Nonaffiliated12,162.0  6,248.1  3,593.8  —  3,122.9  (e)—  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 eliminations due to an intercompany finance lease.
(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.
(e)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.
Three Months Ended June 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$60.4  $—  $—  $60.4  
Sales to AEP Affiliates
177.7  —  —  177.7  
Total Revenues$238.1  $—  $—  $238.1  
Interest Income
$0.7  $38.9  $(38.3) (a)$1.3  
Interest Expense
32.8  38.3  (38.3) (a)32.8  
Income Tax Expense19.2  0.1  —  19.3  
Net Income$73.2  $0.5  (b)$—  $73.7  
Three Months Ended June 30, 2019
State Transcos AEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Revenues from:
External Customers
$57.8  $—  $—  $57.8  
Sales to AEP Affiliates
209.1  —  —  209.1  
Total Revenues$266.9  $—  $—  $266.9  
Interest Income
$0.2  $29.0  $(28.6) (a)$0.6  
Interest Expense
21.4  28.6  (28.6) (a)21.4  
Income Tax Expense 32.9  0.1  —  33.0  
Net Income$135.6  $0.4  (b)$—  $136.0  
Six Months Ended June 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$121.7  $—  $—  $121.7  
Sales to AEP Affiliates411.4—  —  411.4  
Other Revenues0.6  —  —  0.6  
Total Revenues$533.7  $—  $—  $533.7  
Interest Income$0.9  $72.9  $(71.7) (a)$2.1  
Interest Expense62.4  71.7  (71.7) (a)62.4  
Income Tax Expense51.0  0.1  —  51.1  
Net Income$190.5  $1.0  (b)$—  $191.5  
Six Months Ended June 30, 2019
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo Consolidated
(in millions)
Revenues from:
External Customers$108.1  $—  $—  $108.1  
Sales to AEP Affiliates402.3—  —  402.3  
Total Revenues$510.4  $—  $—  $510.4  
Interest Income$0.4  $57.4  $(56.5) (a)$1.3  
Interest Expense43.156.5(56.5) (a)43.1
Income Tax Expense60.5  0.1  —  60.6  
Net Income$239.8  $0.5  (b)$—  $240.3  
June 30, 2020
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
(in millions)
Total Transmission Property$10,545.4  $—  $—  $10,545.4  
Accumulated Depreciation and Amortization488.3  —  —  488.3  
Total Transmission Property – Net$10,057.1  $—  $—  $10,057.1  
Notes Receivable - Affiliated$—  $3,947.4  $(3,947.4) (c)$—  
Total Assets$10,434.6  $4,064.3  (d)$(4,023.2) (e)$10,475.7  
Total Long-term Debt$3,990.0  $3,947.4  $(3,990.0) (c)$3,947.4  
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.