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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Reportable Segment Information          
Vertically Integrated Utilities Revenues $ 2,340.7 $ 2,095.7 $ 4,722.2 $ 4,365.5  
Transmission and Distribution Utilities Revenues 1,127.9 1,026.6 2,269.1 2,093.0  
Generation & Marketing Revenues 435.3 386.5 912.8 945.3  
Corporate and Other Revenues 109.3 67.7 157.4 106.0  
Sales to AEP Affiliates 0.0 0.0 0.0 0.0  
Total Revenues 4,013.2 3,576.5 8,061.5 7,509.8  
Interest Expense 242.3 222.9 476.3 444.7  
Income Tax Expense 72.2 190.6 174.2 533.8  
Net Income (Loss) 530.1 376.2 986.8 970.4  
Balance Sheet Information          
Total Property, Plant and Equipment 70,012.9   70,012.9   $ 67,428.5
Accumulated Depreciation and Amortization 17,571.4   17,571.4   17,167.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 52,441.5   52,441.5   50,261.5
Total Assets 66,870.1   66,870.1   64,729.1
Long-term Debt Due Within One Year 2,281.4   2,281.4   1,753.7
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 19,750.6   19,750.6   19,419.6
Total Long-term Debt Outstanding 22,032.0   22,032.0   21,173.3
Vertically Integrated Utilities [Member]          
Reportable Segment Information          
Vertically Integrated Utilities Revenues 2,340.7 2,095.7 4,722.2 4,365.5  
Sales to AEP Affiliates 8.3 24.8 34.8 45.4  
Total Revenues 2,349.0 2,120.5 4,757.0 4,410.9  
Net Income (Loss) 277.9 121.4 510.7 341.9  
Balance Sheet Information          
Total Property, Plant and Equipment 44,162.5   44,162.5   43,294.4
Accumulated Depreciation and Amortization 13,495.0   13,495.0   13,153.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 30,667.5   30,667.5   30,141.0
Total Assets 38,422.6   38,422.6   37,579.7
Long-term Debt Due Within One Year 1,890.8   1,890.8   1,038.1
Long-term Debt - Affiliated 50.0   50.0   50.0
Long-term Debt 10,455.9   10,455.9   10,801.4
Total Long-term Debt Outstanding 12,396.7   12,396.7   11,889.5
Transmission And Distribution Utilities [Member]          
Reportable Segment Information          
Transmission and Distribution Utilities Revenues 1,127.9 1,026.6 2,269.1 2,093.0  
Sales to AEP Affiliates 9.1 26.9 30.3 46.9  
Total Revenues 1,137.0 1,053.5 2,299.4 2,139.9  
Net Income (Loss) 114.0 111.2 239.4 230.3  
Balance Sheet Information          
Total Property, Plant and Equipment 17,208.3   17,208.3   16,371.2
Accumulated Depreciation and Amortization 3,830.9   3,830.9   3,768.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 13,377.4   13,377.4   12,602.9
Total Assets 16,384.1   16,384.1   16,060.7
Long-term Debt Due Within One Year 341.3   341.3   663.1
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 5,390.2   5,390.2   4,705.4
Total Long-term Debt Outstanding 5,731.5   5,731.5   5,368.5
AEP Transmission Holdco [Member]          
Reportable Segment Information          
Transmission Revenues 103.5 53.0 144.6 80.7  
Sales to AEP Affiliates 109.0 194.3 273.4 322.7  
Total Revenues 212.5 247.3 418.0 403.4  
Net Income (Loss) 101.9 129.0 206.7 201.8  
Balance Sheet Information          
Total Property, Plant and Equipment 7,784.5   7,784.5   7,110.2
Accumulated Depreciation and Amortization 219.0   219.0   176.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 7,565.5   7,565.5   6,933.6
Total Assets 8,666.4   8,666.4   8,141.8
Long-term Debt Due Within One Year 50.0   50.0   50.0
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 2,640.5   2,640.5   2,631.3
Total Long-term Debt Outstanding 2,690.5   2,690.5   2,681.3
Generation And Marketing [Member]          
Reportable Segment Information          
Generation & Marketing Revenues 435.3 386.5 912.8 945.3  
Sales to AEP Affiliates 25.4 24.1 53.0 56.7  
Total Revenues 460.7 410.6 965.8 1,002.0  
Net Income (Loss) 38.6 26.4 56.7 212.6  
Balance Sheet Information          
Total Property, Plant and Equipment 829.8   829.8   644.6
Accumulated Depreciation and Amortization 28.2   28.2   75.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 801.6   801.6   569.6
Total Assets 2,284.4   2,284.4   2,009.8
Long-term Debt Due Within One Year 0.1   0.1   0.0
Long-term Debt - Affiliated 32.2   32.2   32.2
Long-term Debt (0.3)   (0.3)   (0.3)
Total Long-term Debt Outstanding 32.0   32.0   31.9
All Other [Member]          
Reportable Segment Information          
Corporate and Other Revenues [1] 5.8 14.7 12.8 25.3  
Sales to AEP Affiliates [1] 18.0 14.2 35.0 30.1  
Total Revenues [1] 23.8 28.9 47.8 55.4  
Net Income (Loss) [1] (2.3) (11.8) (26.7) (16.2)  
Balance Sheet Information          
Total Property, Plant and Equipment [1] 382.9   382.9   374.5
Accumulated Depreciation and Amortization [1] 185.2   185.2   180.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [1] 197.7   197.7   193.9
Total Assets [1],[2] 4,071.8   4,071.8   3,959.1
Long-term Debt Due Within One Year [1] (0.8)   (0.8)   2.5
Long-term Debt - Affiliated [1] 0.0   0.0   0.0
Long-term Debt [1] 1,264.3   1,264.3   1,281.8
Total Long-term Debt Outstanding [1] 1,263.5   1,263.5   1,284.3
Reconciling Adjustments [Member]          
Reportable Segment Information          
Corporate and Other Revenues 0.0 0.0 0.0 0.0  
Sales to AEP Affiliates (169.8) (284.3) (426.5) (501.8)  
Total Revenues (169.8) (284.3) (426.5) (501.8)  
Net Income (Loss) 0.0 0.0 0.0 0.0  
Balance Sheet Information          
Total Property, Plant and Equipment [3] (355.1)   (355.1)   (366.4)
Accumulated Depreciation and Amortization [3] (186.9)   (186.9)   (186.9)
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [3] (168.2)   (168.2)   (179.5)
Total Assets [3],[4] (2,959.2)   (2,959.2)   (3,022.0)
Long-term Debt Due Within One Year 0.0   0.0   0.0
Long-term Debt - Affiliated (82.2)   (82.2)   (82.2)
Long-term Debt 0.0   0.0   0.0
Total Long-term Debt Outstanding (82.2)   (82.2)   (82.2)
AEP Transmission Co [Member]          
Reportable Segment Information          
Transmission Revenues 51.2 44.0 82.5 63.2  
Corporate and Other Revenues 0.0 0.0 0.1 0.1  
Sales to AEP Affiliates 132.6 185.4 294.7 318.8  
Total Revenues 183.8 229.4 377.3 382.1  
Interest Income 0.4 0.1 0.8 0.3  
Interest Expense 20.3 15.7 40.2 31.7  
Income Tax Expense 20.0 55.8 42.5 84.3  
Net Income (Loss) 70.5 107.4 156.4 164.4  
Balance Sheet Information          
Total Property, Plant and Equipment 7,426.4   7,426.4   6,780.2
Accumulated Depreciation and Amortization 210.5   210.5   170.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 7,215.9   7,215.9   6,609.8
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 7,534.7   7,534.7   7,068.1
Long-term Debt Due Within One Year 50.0   50.0   50.0
Long-term Debt 2,500.9   2,500.9   2,500.4
Total Long-term Debt Outstanding 2,550.9   2,550.9   2,550.4
AEP Transmission Co [Member] | State Transcos [Member]          
Reportable Segment Information          
Transmission Revenues 51.2 44.0 82.5 63.2  
Corporate and Other Revenues 0.0 0.0 0.1 0.1  
Sales to AEP Affiliates 132.6 185.5 294.7 318.9  
Total Revenues 183.8 229.5 377.3 382.2  
Interest Income 0.0 0.0 0.2 0.1  
Interest Expense 20.3 15.9 40.2 31.7  
Income Tax Expense 19.4 55.7 41.7 84.1  
Net Income (Loss) 70.8 107.4 156.8 164.2  
Balance Sheet Information          
Total Property, Plant and Equipment 7,426.4   7,426.4   6,780.2
Accumulated Depreciation and Amortization 210.5   210.5   170.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 7,215.9   7,215.9   6,609.8
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 7,533.4   7,533.4   7,072.9
Total Long-term Debt Outstanding 2,575.0   2,575.0   2,575.0
AEP Transmission Co [Member] | AEPTCo Parent [Member]          
Reportable Segment Information          
Transmission Revenues 0.0 0.0 0.0 0.0  
Corporate and Other Revenues 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 25.2 19.4 50.2 38.5  
Interest Expense 24.8 19.1 49.6 38.3  
Income Tax Expense 0.6 0.1 0.8 0.2  
Net Income (Loss) [5] (0.3) 0.0 (0.4) 0.2  
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 2,575.0   2,575.0   2,550.4
Total Assets [6] 2,623.4   2,623.4   2,590.1
Total Long-term Debt Outstanding 2,550.9   2,550.9   2,550.4
AEP Transmission Co [Member] | Reconciling Adjustments [Member]          
Reportable Segment Information          
Transmission Revenues 0.0 0.0 0.0 0.0  
Corporate and Other Revenues 0.0 0.0 0.0 0.0  
Sales to AEP Affiliates 0.0 (0.1) 0.0 (0.1)  
Total Revenues 0.0 (0.1) 0.0 (0.1)  
Interest Income [7] (24.8) (19.3) (49.6) (38.3)  
Interest Expense [7] (24.8) (19.3) (49.6) (38.3)  
Income Tax Expense 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 [8] (2,575.0)   (2,575.0)   (2,550.4)
Total Assets [9] (2,622.1)   (2,622.1)   (2,594.9)
Total Long-term Debt Outstanding [8] $ (2,575.0)   $ (2,575.0)   $ (2,575.0)
[1] 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.
[2] Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.
[3] Includes eliminations due to an intercompany capital lease.
[4] Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.
[5] limination of AEPTCo Parent’s equity earnings in the State Transcos.
[6] Includes the elimination of AEPTCo Parent’s investments in State Transcos.
[7] Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
[8] Elimination of intercompany debt.
[9] Primarily relates to the elimination of Notes Receivable from the State Transcos.