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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Reportable Segment Information          
Vertically Integrated Utilities Revenues $ 2,453.8 $ 2,538.3 $ 6,819.3 $ 6,864.6  
Transmission and Distribution Utilities Revenues 1,149.7 1,245.4 3,242.7 3,398.9  
Generation & Marketing Revenues 441.5 823.3 1,386.8 2,192.5  
Corporate and Other Revenues 59.7 45.2 165.7 134.0  
Sales to AEP Affiliates 0.0 0.0 0.0 0.0  
Total Revenues 4,104.7 4,652.2 11,614.5 12,590.0  
Interest Expense 223.3 225.3 668.0 667.2  
Income Tax Expense 264.0 (534.5) 797.8 (134.0)  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 556.7 (764.2) 1,527.1 245.3  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 (2.5)  
Net Income (Loss) 556.7 (764.2) 1,527.1 242.8  
Balance Sheet Information          
Total Property, Plant and Equipment 65,438.2   65,438.2   $ 62,036.6
Accumulated Depreciation and Amortization 17,121.7   17,121.7   16,397.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 48,316.5   48,316.5   45,639.3
Assets Held for Sale         1,951.2
Total Assets 63,964.9   63,964.9   63,467.7
Long-term Debt Due Within One Year 2,359.3   2,359.3   2,878.0
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 18,362.4   18,362.4   17,378.4
Total Long-term Debt Outstanding 20,721.7   20,721.7   20,256.4
Liabilities Held for Sale 0.0   0.0   235.9
Vertically Integrated Utilities [Member]          
Reportable Segment Information          
Vertically Integrated Utilities Revenues 2,453.8 2,538.3 6,819.3 6,864.6  
Sales to AEP Affiliates 28.4 18.0 73.8 63.2  
Total Revenues 2,482.2 2,556.3 6,893.1 6,927.8  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 297.3 343.4 639.2 832.6  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 297.3 343.4 639.2 832.6  
Balance Sheet Information          
Total Property, Plant and Equipment 42,722.9   42,722.9   41,552.6
Accumulated Depreciation and Amortization 13,042.9   13,042.9   12,596.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 29,680.0   29,680.0   28,955.9
Assets Held for Sale         0.0
Total Assets 38,136.4   38,136.4   37,428.3
Long-term Debt Due Within One Year 1,107.2   1,107.2   1,519.9
Long-term Debt - Affiliated 50.0   50.0   20.0
Long-term Debt 10,644.2   10,644.2   10,353.3
Total Long-term Debt Outstanding 11,801.4   11,801.4   11,893.2
Liabilities Held for Sale         0.0
Transmission And Distribution Utilities [Member]          
Reportable Segment Information          
Transmission and Distribution Utilities Revenues 1,149.7 1,245.4 3,242.7 3,398.9  
Sales to AEP Affiliates 23.6 30.2 70.5 69.6  
Total Revenues 1,173.3 1,275.6 3,313.2 3,468.5  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 144.0 155.7 374.3 387.8  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 144.0 155.7 374.3 387.8  
Balance Sheet Information          
Total Property, Plant and Equipment 15,695.2   15,695.2   14,762.2
Accumulated Depreciation and Amortization 3,766.2   3,766.2   3,655.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 11,929.0   11,929.0   11,107.2
Assets Held for Sale         0.0
Total Assets 15,765.0   15,765.0   14,802.4
Long-term Debt Due Within One Year 703.4   703.4   309.4
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 4,738.0   4,738.0   4,672.2
Total Long-term Debt Outstanding 5,441.4   5,441.4   4,981.6
Liabilities Held for Sale         0.0
AEP Transmission Holdco [Member]          
Reportable Segment Information          
Transmission Revenues 45.1 39.5 125.8 110.1  
Sales to AEP Affiliates 133.4 92.9 456.1 272.6  
Total Revenues 178.5 132.4 581.9 382.7  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 76.5 69.5 278.3 209.5  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 76.5 69.5 278.3 209.5  
Balance Sheet Information          
Total Property, Plant and Equipment 6,394.2   6,394.2   5,354.0
Accumulated Depreciation and Amortization 156.6   156.6   101.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 6,237.6   6,237.6   5,252.6
Assets Held for Sale         0.0
Total Assets 7,631.2   7,631.2   6,384.8
Long-term Debt Due Within One Year 0.0   0.0   0.0
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 2,682.1   2,682.1   2,055.7
Total Long-term Debt Outstanding 2,682.1   2,682.1   2,055.7
Liabilities Held for Sale         0.0
Generation And Marketing [Member]          
Reportable Segment Information          
Generation & Marketing Revenues 441.5 823.3 1,386.8 2,192.5  
Sales to AEP Affiliates 24.0 36.1 80.7 98.7  
Total Revenues 465.5 859.4 1,467.5 2,291.2  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 33.7 (1,369.2) 246.3 (1,248.8)  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 33.7 (1,369.2) 246.3 (1,248.8)  
Balance Sheet Information          
Total Property, Plant and Equipment 632.9   632.9   364.7
Accumulated Depreciation and Amortization 161.7   161.7   42.2
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 471.2   471.2   322.5
Assets Held for Sale         1,951.2
Total Assets 1,904.4   1,904.4   3,386.1
Long-term Debt Due Within One Year 0.1   0.1   500.1
Long-term Debt - Affiliated 32.2   32.2   32.2
Long-term Debt (0.3)   (0.3)   0.0
Total Long-term Debt Outstanding 32.0   32.0   532.3
Liabilities Held for Sale         235.9
All Other [Member]          
Reportable Segment Information          
Corporate and Other Revenues [1] 14.6 5.7 39.9 23.9  
Sales to AEP Affiliates [1] 16.7 19.1 46.8 55.2  
Total Revenues [1] 31.3 24.8 86.7 79.1  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [1] 5.2 36.4 (11.0) 64.2  
Income (Loss) from Discontinued Operations, Net of Tax [1] 0.0 0.0 0.0 (2.5)  
Net Income (Loss) [1] 5.2 36.4 (11.0) 61.7  
Balance Sheet Information          
Total Property, Plant and Equipment [1] 359.5   359.5   356.6
Accumulated Depreciation and Amortization [1] 180.8   180.8   186.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [1] 178.7   178.7   170.6
Assets Held for Sale         0.0
Total Assets [1] 22,339.9   22,339.9   20,354.8
Long-term Debt Due Within One Year [1] 548.6   548.6   548.6
Long-term Debt - Affiliated [1] 0.0   0.0   0.0
Long-term Debt [1] 298.4   298.4   297.2
Total Long-term Debt Outstanding [1] 847.0   847.0   845.8
Liabilities Held for Sale         0.0
Reconciling Adjustments [Member]          
Reportable Segment Information          
Corporate and Other Revenues 0.0 0.0 0.0 0.0  
Total Revenues (226.1) (196.3) (727.9) (559.3)  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0 0.0  
Income (Loss) from Discontinued Operations, Net of Tax 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 [2] (366.5)   (366.5)   (353.5)
Accumulated Depreciation and Amortization [2] (186.5)   (186.5)   (184.0)
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [2] (180.0)   (180.0)   (169.5)
Assets Held for Sale         0.0
Total Assets [2],[3] (21,812.0)   (21,812.0)   (18,888.7)
Long-term Debt Due Within One Year 0.0   0.0   0.0
Long-term Debt - Affiliated (82.2)   (82.2)   (52.2)
Long-term Debt 0.0   0.0   0.0
Total Long-term Debt Outstanding (82.2)   (82.2)   (52.2)
Liabilities Held for Sale         0.0
AEP Transmission Co [Member]          
Reportable Segment Information          
Transmission Revenues 35.9 33.5 99.2 89.6  
Sales to AEP Affiliates 131.4 91.8 450.2 268.4  
Total Revenues 167.3 125.3 549.4 358.0  
Interest Income 0.2 0.1 0.5 0.2  
Interest Expense 16.9 11.0 48.6 32.3  
Income Tax Expense 30.2 26.4 114.5 73.9  
Equity Earnings in State Transcos 0.0 0.0 0.0 0.0  
Net Income (Loss) 59.9 52.4 224.3 153.0  
Balance Sheet Information          
Total Property, Plant and Equipment 6,067.5   6,067.5   5,054.2
Accumulated Depreciation and Amortization 151.5   151.5   99.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,916.0   5,916.0   4,954.6
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 6,548.9   6,548.9   5,349.8
Long-term Debt 2,550.0   2,550.0   1,932.0
Total Long-term Debt Outstanding 2,550.0   2,550.0   1,932.0
AEP Transmission Co [Member] | State Transcos [Member]          
Reportable Segment Information          
Transmission Revenues 35.9 33.5 99.2 89.6  
Sales to AEP Affiliates 131.3 91.8 450.2 268.4  
Total Revenues 167.2 125.3 549.4 358.0  
Interest Income 0.0 0.0 0.1 0.0  
Interest Expense 16.9 11.0 48.6 32.3  
Income Tax Expense 30.2 26.4 114.3 73.9  
Equity Earnings in State Transcos 0.0 0.0 0.0 0.0  
Net Income (Loss) 59.8 52.3 224.0 153.0  
Balance Sheet Information          
Total Property, Plant and Equipment 6,067.5   6,067.5   5,054.2
Accumulated Depreciation and Amortization 151.5   151.5   99.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,916.0   5,916.0   4,954.6
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 6,455.2   6,455.2   5,337.5
Total Long-term Debt Outstanding 2,475.6   2,475.6   1,932.0
AEP Transmission Co [Member] | AEPTCo Parent [Member]          
Reportable Segment Information          
Transmission 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 19.5 14.0 58.0 41.8  
Interest Expense 19.3 13.9 57.6 41.6  
Income Tax Expense 0.0 0.0 0.2 0.0  
Equity Earnings in State Transcos 59.8 52.3 224.0 153.0  
Net Income (Loss) 59.9 52.4 224.3 153.0  
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 2,500.0   2,500.0   1,950.0
Total Assets 5,010.8   5,010.8   3,947.8
Total Long-term Debt Outstanding 2,574.4   2,574.4   1,950.0
AEP Transmission Co [Member] | Reconciling Adjustments [Member]          
Reportable Segment Information          
Transmission Revenues 0.0 0.0 0.0 0.0  
Sales to AEP Affiliates 0.1 0.0 0.0 0.0  
Total Revenues 0.1 0.0 0.0 0.0  
Interest Income [4] (19.3) (13.9) (57.6) (41.6)  
Interest Expense [4] (19.3) (13.9) (57.6) (41.6)  
Income Tax Expense 0.0 0.0 0.0 0.0  
Equity Earnings in State Transcos [5] (59.8) (52.3) (224.0) (153.0)  
Net Income (Loss) [5] (59.8) $ (52.3) (224.0) $ (153.0)  
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 [6] (2,500.0)   (2,500.0)   (1,950.0)
Total Assets [7] (4,917.1)   (4,917.1)   (3,935.5)
Total Long-term Debt Outstanding [6] $ (2,500.0)   $ (2,500.0)   $ (1,950.0)
[1] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries, Parent’s guarantee revenue received from affiliates, investment income, interest income and interest expense and other nonallocated costs.
[2] Includes eliminations due to an intercompany capital lease.
[3] Reconciling Adjustments for Total Assets primarily include the elimination of intercompany advances to affiliates and intercompany accounts receivable along with the elimination of AEP’s investments in subsidiary companies.
[4] Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
[5] Elimination of AEPTCo Parent’s equity earnings in the State Transcos.
[6] Elimination of intercompany debt.
[7] Primarily relates to the elimination of AEPTCo Parent’s investment in the State Transcos and Note Receivable from the State Transcos.