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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Reportable Segment Information              
Revenue from Contracts with Customers $ 3,573.6   $ 4,013.2   $ 7,630.4 $ 8,061.5  
Sales to AEP Affiliates 0.0   0.0   0.0 0.0  
Total Revenues 3,573.6   4,013.2   7,630.4 8,061.5  
Interest Expense 250.7   242.3   506.5 476.3  
Income Tax Expense (Benefit) (54.4)   72.2   (9.9) 174.2  
Net Income (Loss) 459.1 $ 574.1 530.1 $ 456.7 1,033.2 986.8  
Balance Sheet Information              
Total Property, Plant and Equipment 75,642.0       75,642.0   $ 73,085.2
Accumulated Depreciation and Amortization 18,439.1       18,439.1   17,986.1
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 57,202.9       57,202.9   55,099.1
Total Assets 72,550.0       72,550.0   68,802.8
Long-term Debt Due Within One Year 1,257.4       1,257.4   1,698.5
Long-term Debt - Affiliated 0.0       0.0   0.0
Long-term Debt 24,174.4       24,174.4   21,648.2
Total Long-term Debt Outstanding 25,431.8       25,431.8   23,346.7
Vertically Integrated Utilities [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 2,116.4   2,340.7   4,488.7 4,722.2  
Transmission and Distribution Utilities Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 1,001.6   1,127.9   2,181.4 2,269.1  
Generation and Marketing Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 382.9   435.3   822.6 912.8  
Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 72.7   109.3   137.7 157.4  
Total Revenues (9.4) [1]   (8.6) [2]   40.3 [3] 19.9 [4]  
AEP Transmission Co [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 209.1   144.7   402.3 305.4  
Total Revenues 266.9   200.1 [5]   510.4 391.8 [6]  
Interest Income 0.6   0.4   1.3 0.8  
Interest Expense 21.4   20.6   43.1 40.9  
Income Tax Expense (Benefit) 33.0   24.1   60.6 46.1  
Net Income (Loss) 136.0 $ 104.3 82.0 $ 84.1 240.3 166.1  
Balance Sheet Information              
Total Property, Plant and Equipment 8,907.5 [7]       8,907.5 [7]   8,268.1
Accumulated Depreciation and Amortization 336.6 [7]       336.6 [7]   271.9
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 8,570.9 [7]       8,570.9 [7]   7,996.2
Notes Receivable, Related Parties 0.0       0.0   0.0
Total Assets 8,879.2 [7]       8,879.2 [7]   8,394.1
Long-term Debt Due Within One Year 85.0       85.0   85.0
Long-term Debt 3,082.9       3,082.9   2,738.0
Total Long-term Debt Outstanding 3,167.9       3,167.9   2,823.0
AEP Transmission Co [Member] | Transmission [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 57.8   55.4   108.1 86.3  
AEP Transmission Co [Member] | Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.1  
Total Revenues 0.0 [8]   0.0 [5],[9]   0.0 [10] 0.0 [6],[11]  
Reconciling Adjustments [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.0  
Sales to AEP Affiliates (311.3)   (169.8)   (643.5) (426.5)  
Total Revenues (311.3)   (169.8)   (643.5) (426.5)  
Net Income (Loss) 0.0   0.0   0.0 0.0  
Balance Sheet Information              
Total Property, Plant and Equipment [12] (354.5)       (354.5)   (354.6)
Accumulated Depreciation and Amortization [12] (186.4)       (186.4)   (186.5)
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [12] (168.1)       (168.1)   (168.1)
Total Assets [12],[13] (3,251.8)       (3,251.8)   (2,714.8)
Long-term Debt Due Within One Year 0.0       0.0   0.0
Long-term Debt - Affiliated (91.2)       (91.2)   (82.2)
Long-term Debt 0.0       0.0   0.0
Total Long-term Debt Outstanding (91.2)       (91.2)   (82.2)
Reconciling Adjustments [Member] | Other Revenues [Member]              
Reportable Segment Information              
Total Revenues (69.4) [1]   (21.3) [2]   (69.4) [3] (43.0) [4]  
Reconciling Adjustments [Member] | AEP Transmission Co [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.0  
Sales to AEP Affiliates 0.0   0.0   0.0 0.0  
Total Revenues 0.0   0.0   0.0 0.0  
Interest Income (28.6)   (24.8) [7]   (56.5) [7] (49.6) [7]  
Interest Expense (28.6)   (24.8) [7]   (56.5) [7] (49.6) [7]  
Income Tax Expense (Benefit) 0.0   0.0   0.0 0.0  
Net Income (Loss) 0.0   0.0   0.0 0.0  
Balance Sheet Information              
Total Property, Plant and Equipment 0.0       0.0   0.0
Accumulated Depreciation and Amortization 0.0       0.0   0.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 0.0       0.0   0.0
Notes Receivable, Related Parties [14] (3,167.9)       (3,167.9)   (2,823.0)
Total Assets [15] (3,237.4)       (3,237.4)   (2,869.8)
Total Long-term Debt Outstanding [14] (3,200.0)       (3,200.0)   (2,850.0)
Reconciling Adjustments [Member] | AEP Transmission Co [Member] | Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.0  
Vertically Integrated Utilities [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 7.4   8.3   38.4 34.8  
Total Revenues 2,123.8   2,349.0   4,527.1 4,757.0  
Net Income (Loss) 178.8   277.9   482.4 510.7  
Balance Sheet Information              
Total Property, Plant and Equipment 46,201.8       46,201.8   45,365.1
Accumulated Depreciation and Amortization 14,124.6       14,124.6   13,822.5
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 32,077.2       32,077.2   31,542.6
Total Assets 40,430.0       40,430.0   38,874.3
Long-term Debt Due Within One Year 674.5       674.5   1,066.3
Long-term Debt - Affiliated 59.0       59.0   50.0
Long-term Debt 12,210.3       12,210.3   11,442.7
Total Long-term Debt Outstanding 12,943.8       12,943.8   12,559.0
Vertically Integrated Utilities [Member] | Vertically Integrated Utilities [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 2,116.4   2,340.7   4,488.7 4,722.2  
Vertically Integrated Utilities [Member] | Other Revenues [Member]              
Reportable Segment Information              
Total Revenues 0.0 [1]   (14.2) [2]   0.0 [3] (8.7) [4]  
Transmission And Distribution Utilities [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 44.1   9.1   86.3 30.3  
Total Revenues 1,045.7   1,137.0   2,267.7 2,299.4  
Net Income (Loss) 131.4   114.0   287.9 239.4  
Balance Sheet Information              
Total Property, Plant and Equipment 18,874.5       18,874.5   18,126.7
Accumulated Depreciation and Amortization 3,878.3       3,878.3   3,833.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 14,996.2       14,996.2   14,293.0
Total Assets 17,769.1       17,769.1   17,083.4
Long-term Debt Due Within One Year 334.5       334.5   549.1
Long-term Debt - Affiliated 0.0       0.0   0.0
Long-term Debt 5,798.2       5,798.2   5,048.8
Total Long-term Debt Outstanding 6,132.7       6,132.7   5,597.9
Transmission And Distribution Utilities [Member] | Transmission and Distribution Utilities Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 1,001.6   1,127.9   2,181.4 2,269.1  
Transmission And Distribution Utilities [Member] | Other Revenues [Member]              
Reportable Segment Information              
Total Revenues 39.0 [1]   21.3 [2]   78.4 [3] 43.0 [4]  
AEP Transmission Holdco [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 209.1   109.0   404.3 273.4  
Total Revenues 278.9   212.5   535.3 418.0  
Net Income (Loss) 155.4   101.9   280.6 206.7  
Balance Sheet Information              
Total Property, Plant and Equipment 9,330.3       9,330.3   8,659.5
Accumulated Depreciation and Amortization 350.1       350.1   282.8
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 8,980.2       8,980.2   8,376.7
Total Assets 10,088.4       10,088.4   9,543.7
Long-term Debt Due Within One Year 248.2       248.2   85.0
Long-term Debt - Affiliated 0.0       0.0   0.0
Long-term Debt 3,082.9       3,082.9   2,888.6
Total Long-term Debt Outstanding 3,331.1       3,331.1   2,973.6
AEP Transmission Holdco [Member] | Transmission [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 69.8   103.5   131.0 144.6  
Generation And Marketing [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 29.8   25.4   71.9 53.0  
Total Revenues 412.7   460.7   894.5 965.8  
Net Income (Loss) 5.2   38.6   44.4 56.7  
Balance Sheet Information              
Total Property, Plant and Equipment 1,176.7       1,176.7   893.3
Accumulated Depreciation and Amortization 79.2       79.2   47.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 1,097.5       1,097.5   846.3
Total Assets 2,795.2       2,795.2   1,979.7
Long-term Debt Due Within One Year 0.0       0.0   0.1
Long-term Debt - Affiliated 32.2       32.2   32.2
Long-term Debt (0.3)       (0.3)   (0.3)
Total Long-term Debt Outstanding 31.9       31.9   32.0
Generation And Marketing [Member] | Generation and Marketing Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 382.9   435.3   822.6 912.8  
Generation And Marketing [Member] | Other Revenues [Member]              
Reportable Segment Information              
Total Revenues 18.7 [1]   3.1 [2]   26.8 [3] 24.1 [4]  
All Other [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 20.9   18.0 [16]   42.6 35.0 [16]  
Total Revenues [16] 23.8   23.8   49.3 47.8  
Net Income (Loss) (11.7)   (2.3) [16]   (62.1) (26.7) [16]  
Balance Sheet Information              
Total Property, Plant and Equipment 413.2       413.2   395.2 [16]
Accumulated Depreciation and Amortization 193.3       193.3   186.6 [16]
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [16] 219.9       219.9   208.6
Total Assets [17] 4,719.1       4,719.1   4,036.5 [16]
Long-term Debt Due Within One Year [18] 0.2       0.2   (2.0) [16]
Long-term Debt - Affiliated 0.0       0.0   0.0 [16]
Long-term Debt 3,083.3       3,083.3   2,268.4 [16]
Total Long-term Debt Outstanding [16],[18] 3,083.5       3,083.5   2,266.4
All Other [Member] | Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 2.9   5.8 [16]   6.7 12.8 [16]  
Total Revenues 2.3 [1]   2.5 [2]   4.5 [3] 4.5 [4]  
State Transcos [Member] | AEP Transmission Co [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 209.1   144.7   402.3 305.4  
Total Revenues 266.9   200.1   510.4 391.8  
Interest Income 0.2   0.0   0.4 0.2  
Interest Expense 21.4   20.6   43.1 40.9  
Income Tax Expense (Benefit) 32.9   23.6   60.5 45.3  
Net Income (Loss) 135.6   82.4   239.8 166.5  
Balance Sheet Information              
Total Property, Plant and Equipment 8,907.5       8,907.5   8,268.1
Accumulated Depreciation and Amortization 336.6       336.6   271.9
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 8,570.9 [7]       8,570.9 [7]   7,996.2
Notes Receivable, Related Parties 0.0       0.0   0.0
Total Assets 8,897.7       8,897.7   8,406.8
Total Long-term Debt Outstanding 3,200.0       3,200.0   2,850.0
State Transcos [Member] | AEP Transmission Co [Member] | Transmission [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 57.8   55.4   108.1 86.3  
State Transcos [Member] | AEP Transmission Co [Member] | Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.1  
AEPTCo Parent [Member] | AEP Transmission Co [Member]              
Reportable Segment Information              
Sales to AEP Affiliates 0.0   0.0   0.0 0.0  
Total Revenues 0.0   0.0   0.0 0.0  
Interest Income 29.0   25.2   57.4 50.2  
Interest Expense 28.6   24.8   56.5 49.6  
Income Tax Expense (Benefit) 0.1   0.5   0.1 0.8  
Net Income (Loss) 0.4   (0.4) [19]   0.5 [19] (0.4) [14]  
Balance Sheet Information              
Total Property, Plant and Equipment 0.0       0.0   0.0
Accumulated Depreciation and Amortization 0.0       0.0   0.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 0.0       0.0   0.0
Notes Receivable, Related Parties 3,167.9       3,167.9   2,823.0
Total Assets [20] 3,218.9       3,218.9   2,857.1
Total Long-term Debt Outstanding 3,167.9       3,167.9   $ 2,823.0
AEPTCo Parent [Member] | AEP Transmission Co [Member] | Transmission [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers 0.0   0.0   0.0 0.0  
AEPTCo Parent [Member] | AEP Transmission Co [Member] | Other Revenues [Member]              
Reportable Segment Information              
Revenue from Contracts with Customers $ 0.0   $ 0.0   $ 0.0 $ 0.0  
[1]
Amounts include affiliated and nonaffiliated revenues.
[2]
Amounts include affiliated and nonaffiliated revenues.
[3]
Amounts include affiliated and nonaffiliated revenues.
[4]
Amounts include affiliated and nonaffiliated revenues.
[5]
These amounts presented reflect the revisions made to AEPTCo’s previously issued financial statement. See the “revisions to Previously Issued Financial Statements” section of Note 1 for additional information.
[6]
The amounts presented reflect the revisions made to AEPTCo’s previously issued financial statements. For additional details on revisions made to AEPTCo’s financial statements, see Note 1- Significant Accounting Matters.
[7]
Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
[8]
Amounts include affiliated and nonaffiliated revenues.
[9]
Amounts include affiliated and nonaffiliated revenues.
[10]
Amounts include affiliated and nonaffiliated revenues.
[11]
Amounts include affiliated and nonaffiliated revenues.
[12]
Includes eliminations due to an intercompany finance lease.
[13]
Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.
[14]
Elimination of intercompany debt.
[15]
Primarily relates to the elimination of Notes Receivable from the State Transcos.
[16]
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 and interest expense and other nonallocated costs.
[17]
Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.
[18]
Amounts reflect the impact of fair value hedge accounting. See “Accounting for Fair Value Hedging Strategies” section of Note 10 for additional information.
[19]
Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.
[20]
Includes the elimination of AEPTCo Parent’s investments in State Transcos.