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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2020
Reportable Segment Information
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration & MarketingCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
2020
Revenues from:
External Customers
$8,753.2 $4,238.7 $297.4 $1,621.0 $8.2 $— $14,918.5 
Other Operating Segments
126.2 107.2 901.4 104.6 88.6 (1,328.0)— 
Total Revenues$8,879.4 $4,345.9 $1,198.8 $1,725.6 $96.8 $(1,328.0)$14,918.5 
Depreciation and Amortization
$1,600.5 $751.1 $257.6 $72.8 $0.8 $— $2,682.8 
Interest Expense565.0 289.2 133.2 24.0 196.4 (42.1)1,165.7 
Income Tax Expense (Benefit)
(7.0)29.7 130.8 (108.0)(5.0)— 40.5 
Equity Earnings of Unconsolidated Subsidiaries2.9 — 82.4 3.2 2.6 — 91.1 
Net Income (Loss)$1,064.5 $496.4 $508.5 $216.9 $(89.6)$— $2,196.7 
Gross Property Additions
$2,291.2 $2,108.1 $1,649.3 $197.0 $16.0 $(15.3)$6,246.3 
Total Property, Plant and Equipment
$49,023.3 $21,145.0 $11,827.2 $1,910.2 $407.3 $— $84,313.0 
Accumulated Depreciation and Amortization
15,586.2 3,879.3 595.7 166.1 184.1 — 20,411.4 
Total Property, Plant and Equipment – Net
$33,437.1 $17,265.7 $11,231.5 $1,744.1 $223.2 $— $63,901.6 
Total Assets$42,752.7 $19,765.9 $12,627.3 $3,585.9 $5,987.1 (b)$(3,961.7)(c)$80,757.2 
Investments in Equity Method Investees
$37.1 $2.1 $831.3 $467.0 $68.8 $— $1,406.3 
Long-term Debt Due Within One Year:
Nonaffiliated
$1,034.6 $588.8 $52.3 $— $410.4 (d)$— $2,086.1 
Long-term Debt:
Affiliated
65.0 — — — — (65.0)— 
Nonaffiliated
12,375.6 6,661.9 4,075.7 — 5,873.2 (d)— 28,986.4 
Total Long-term Debt
$13,475.2 $7,250.7 $4,128.0 $— $6,283.6 $(65.0)$31,072.5 
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration & MarketingCorporate and Other (a)Reconciling AdjustmentsConsolidated
(in millions)
2019
Revenues from:
External Customers
$9,245.7 $4,319.0 $260.2 $1,721.8 $14.7 $— $15,561.4 
Other Operating Segments
121.4 163.5 813.0 135.8 81.1 (1,314.8)— 
Total Revenues$9,367.1 $4,482.5 $1,073.2 $1,857.6 $95.8 $(1,314.8)$15,561.4 
Asset Impairments and Other Related Charges
$92.9 $32.5 $— $31.0 $— $— $156.4 
Depreciation and Amortization
1,447.0 789.5 183.4 69.5 0.6 24.5 (e)2,514.5 
Interest Expense568.3 243.3 103.3 30.0 193.7 (66.1)(e)1,072.5 
Income Tax Expense (Benefit)
(97.7)(25.2)136.2 (53.8)27.6 — (12.9)
Equity Earnings (Loss) of Unconsolidated Subsidiaries3.0 — 72.8 (3.8)0.1 — 72.1 
Net Income (Loss)$985.6 $451.0 $520.1 $104.1 $(141.0)$— $1,919.8 
Gross Property Additions
$2,437.4 $2,074.3 $1,458.9 $1,005.1 $14.5 $(20.4)$6,969.8 
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 
Investments in Equity Method Investees
$41.7 $2.5 $787.5 $459.5 $65.4 $— $1,356.6 
Long-term Debt Due Within One Year:
Affiliated$20.0 $— $— $— $— $(20.0)— 
Nonaffiliated
704.7 392.2 — — 501.8 (d)— 1,598.7 
Long-term Debt:
Affiliated
39.0 — — — — (39.0)— 
Nonaffiliated
12,162.0 6,248.1 3,593.8 — 3,122.9 — 25,126.8 
Total Long-term Debt
$12,925.7 $6,640.3 $3,593.8 $— $3,624.7 (d)$(59.0)$26,725.5 
Vertically Integrated UtilitiesTransmission and Distribution UtilitiesAEP Transmission HoldcoGeneration & MarketingCorporate and Other(a)Reconciling AdjustmentsConsolidated
(in millions)
2018
Revenues from:
External Customers
$9,556.7 $4,552.3 $248.6 $1,818.1 $20.0 $— $16,195.7 
Other Operating Segments
88.8 100.8 555.5 122.2 75.1 (942.4)— 
Total Revenues$9,645.5 $4,653.1 $804.1 $1,940.3 $95.1 $(942.4)$16,195.7 
Asset Impairments and Other Related Charges
$3.4 $— $— $47.7 $19.5 $— $70.6 
Depreciation and Amortization
1,316.2 734.1 137.8 41.0 0.4 57.1 (e)2,286.6 
Interest Expense
567.8 248.1 90.7 14.9 122.6 (59.7)(e)984.4 
Income Tax Expense
5.7 42.4 95.3 (49.2)21.1 — 115.3 
Equity Earnings of Unconsolidated Subsidiaries2.7 — 68.7 0.5 1.2 — 73.1 
Net Income (Loss)
$995.5 $527.4 $373.0 $134.7 $(99.3)$— $1,931.3 
Gross Property Additions
$2,282.2 $2,162.4 $1,614.1 $289.7 $16.3 $(39.2)$6,325.5 
Total Assets
$38,874.3 $17,083.4 $9,543.7 $1,979.7 $4,036.5 (b)$(2,714.8)(c)(e)$68,802.8 

(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 reflect 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.
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
2020(in millions)
Revenues from:
External Customers
$248.8 $— $— $248.8 
Sales to AEP Affiliates
896.3 — — 896.3 
Other Revenues
0.6 — — 0.6 
Total Revenues$1,145.7 $— $— $1,145.7 
Depreciation and Amortization
$249.0 $— $— $249.0 
Interest Income
0.9 149.6 (148.1)(a)2.4 
Allowance for Equity Funds Used During Construction 74.0 — — 74.0 
Interest Expense 127.8 148.1 (148.1)(a)127.8 
Income Tax Expense 106.5 0.2 — 106.7 
Net Income $422.3 $1.1 (b)$— $423.4 
Gross Property Additions$1,621.9 $— $— $1,621.9 
Total Transmission Property$11,345.6 $— $— $11,345.6 
Accumulated Depreciation and Amortization 572.8 — — 572.8 
Total Transmission Property - Net$10,772.8 $— $— $10,772.8 
Notes Receivable - Affiliated$— $3,948.5 $(3,948.5)(c)$— 
Total Assets$11,185.1 $4,084.0 (d)$(4,023.1)(e)$11,246.0 
Total Long-Term Debt$3,990.0 $3,948.5 $(3,990.0)(c)$3,948.5 
State Transcos AEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
2019(in millions)
Revenues from:
External Customers
$214.6 $— $— $214.6 
Sales to AEP Affiliates
806.7 — — 806.7 
Other Revenues
0.1 — — 0.1 
Total Revenues$1,021.4 $— $— $1,021.4 
Depreciation and Amortization
$176.0 $— $— $176.0 
Interest Income
1.3 123.8 (122.1)(a)3.0 
Allowance for Equity Funds Used During Construction 84.3 — — 84.3 
Interest Expense 97.4 122.1 (122.1)(a)97.4 
Income Tax Expense 117.1 0.3 — 117.4 
Net Income $438.6 $1.1 (b)$— $439.7 
Gross Property Additions$1,419.5 $— $— $1,419.5 
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 
State TranscosAEPTCo ParentReconciling AdjustmentsAEPTCo
Consolidated
2018(in millions)
Revenues from:
External Customers
$177.0 $— $— $177.0 
Sales to AEP Affiliates
598.9 — — 598.9 
Other
0.2 — — 0.2 
Total Revenues$776.1 $— $— $776.1 
Depreciation and Amortization
$133.9 $— $— $133.9 
Interest Income
1.3 104.6 (103.4)(a)2.5 
Allowance for Equity Funds Used During Construction 70.6 — — 70.6 
Interest Expense83.2 103.4 (103.4)(a)83.2 
Income Tax Expense 83.9 0.2 — 84.1 
Net Income$314.9 $1.0 (b)$— $315.9 
Gross Property Additions$1,570.8 $— $— $1,570.8 
Total Assets$8,406.8 $2,857.1 (d)$(2,869.8)(e)$8,394.1 

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