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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Reportable Segment Information          
Revenue, Net $ 3,576.5 $ 3,892.9 $ 7,509.8 $ 7,937.8  
Total Revenues 3,576.5 3,892.9 7,509.8 7,937.8  
Interest Expense 222.9 224.9 444.7 441.9  
Income Tax Expense 190.6 165.0 533.8 400.5  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 376.2 506.4 970.4 1,009.5  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 (2.5) 0.0 (2.5)  
Net Income (Loss) 376.2 503.9 970.4 1,007.0  
Balance Sheet Information          
Total Property, Plant and Equipment 64,134.8   64,134.8   $ 62,036.6
Accumulated Depreciation and Amortization 16,907.6   16,907.6   16,397.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 47,227.2   47,227.2   45,639.3
Assets Held for Sale         1,951.2
Total Assets 62,739.1   62,739.1   63,467.7
Long-term Debt Due Within One Year 2,755.0   2,755.0   2,878.0
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 16,796.9   16,796.9   17,378.4
Total Long-term Debt Outstanding 19,551.9   19,551.9   20,256.4
Liabilities Held for Sale         235.9
Vertically Integrated Utilities [Member]          
Reportable Segment Information          
Revenue, Net 2,095.7 2,108.2 4,365.5 4,326.3  
Total Revenues 2,120.5 2,125.9 4,410.9 4,371.5  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 121.4 210.5 341.9 489.2  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 121.4 210.5 341.9 489.2  
Balance Sheet Information          
Total Property, Plant and Equipment 42,313.2   42,313.2   41,552.6
Accumulated Depreciation and Amortization 12,880.0   12,880.0   12,596.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 29,433.2   29,433.2   28,955.9
Assets Held for Sale         0.0
Total Assets 37,914.1   37,914.1   37,428.3
Long-term Debt Due Within One Year 1,449.6   1,449.6   1,519.9
Long-term Debt - Affiliated 40.0   40.0   20.0
Long-term Debt 10,347.5   10,347.5   10,353.3
Total Long-term Debt Outstanding 11,837.1   11,837.1   11,893.2
Liabilities Held for Sale         0.0
Transmission And Distribution Utilities [Member]          
Reportable Segment Information          
Revenue, Net 1,026.6 1,076.2 2,093.0 2,153.5  
Total Revenues 1,053.5 1,096.1 2,139.9 2,192.9  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 111.2 124.6 230.3 232.1  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 111.2 124.6 230.3 232.1  
Balance Sheet Information          
Total Property, Plant and Equipment 15,292.0   15,292.0   14,762.2
Accumulated Depreciation and Amortization 3,737.9   3,737.9   3,655.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 11,554.1   11,554.1   11,107.2
Assets Held for Sale         0.0
Total Assets 15,092.4   15,092.4   14,802.4
Long-term Debt Due Within One Year 756.9   756.9   309.4
Long-term Debt - Affiliated 0.0   0.0   0.0
Long-term Debt 4,088.0   4,088.0   4,672.2
Total Long-term Debt Outstanding 4,844.9   4,844.9   4,981.6
Liabilities Held for Sale         0.0
AEP Transmission Holdco [Member]          
Reportable Segment Information          
Revenue, Net 53.0 41.3 80.7 70.6  
Total Revenues 247.3 161.7 403.4 250.3  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 129.0 95.3 201.8 140.0  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 129.0 95.3 201.8 140.0  
Balance Sheet Information          
Total Property, Plant and Equipment 6,012.1   6,012.1   5,354.0
Accumulated Depreciation and Amortization 137.0   137.0   101.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,875.1   5,875.1   5,252.6
Assets Held for Sale         0.0
Total Assets 7,024.9   7,024.9   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 2,063.5   2,063.5   2,055.7
Total Long-term Debt Outstanding 2,063.5   2,063.5   2,055.7
Liabilities Held for Sale         0.0
Generation And Marketing [Member]          
Reportable Segment Information          
Revenue, Net 386.5 655.3 945.3 1,369.2  
Total Revenues 410.6 683.8 1,002.0 1,431.8  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 26.4 49.7 212.6 120.4  
Income (Loss) from Discontinued Operations, Net of Tax 0.0 0.0 0.0 0.0  
Net Income (Loss) 26.4 49.7 212.6 120.4  
Balance Sheet Information          
Total Property, Plant and Equipment 518.4   518.4   364.7
Accumulated Depreciation and Amortization 145.1   145.1   42.2
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 373.3   373.3   322.5
Assets Held for Sale         1,951.2
Total Assets 1,905.7   1,905.7   3,386.1
Long-term Debt Due Within One Year 0.0   0.0   500.1
Long-term Debt - Affiliated 32.2   32.2   32.2
Long-term Debt 0.0   0.0   0.0
Total Long-term Debt Outstanding 32.2   32.2   532.3
Liabilities Held for Sale         235.9
All Other [Member]          
Reportable Segment Information          
Revenue, Net [1] 14.7 11.9 25.3 18.2  
Total Revenues [1] 28.9 29.9 55.4 54.3  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [1] (11.8) 26.3 (16.2) 27.8  
Income (Loss) from Discontinued Operations, Net of Tax [1] 0.0 (2.5) 0.0 (2.5)  
Net Income (Loss) [1] (11.8) 23.8 (16.2) 25.3  
Balance Sheet Information          
Total Property, Plant and Equipment [1] 365.6   365.6   356.6
Accumulated Depreciation and Amortization [1] 194.0   194.0   186.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [1] 171.6   171.6   170.6
Assets Held for Sale         0.0
Total Assets [1] 21,147.9   21,147.9   20,354.8
Long-term Debt Due Within One Year [1] 548.5   548.5   548.6
Long-term Debt - Affiliated [1] 0.0   0.0   0.0
Long-term Debt [1] 297.9   297.9   297.2
Total Long-term Debt Outstanding [1] 846.4   846.4   845.8
Liabilities Held for Sale         0.0
Consolidation, Eliminations [Member]          
Reportable Segment Information          
Revenue, Net 0.0 0.0 0.0 0.0  
Total Revenues (284.3) (204.5) (501.8) (363.0)  
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] (186.4)   (186.4)   (184.0)
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [2] (180.1)   (180.1)   (169.5)
Assets Held for Sale         0.0
Total Assets [2],[3] (20,345.9)   (20,345.9)   (18,888.7)
Long-term Debt Due Within One Year 0.0   0.0   0.0
Long-term Debt - Affiliated (72.2)   (72.2)   (52.2)
Long-term Debt 0.0   0.0   0.0
Total Long-term Debt Outstanding (72.2)   (72.2)   (52.2)
Liabilities Held for Sale         0.0
Segment Reconciling Items [Member]          
Reportable Segment Information          
Revenue, Net (284.3) (204.5) (501.8) (363.0)  
Segment Reconciling Items [Member] | Vertically Integrated Utilities [Member]          
Reportable Segment Information          
Revenue, Net 24.8 17.7 45.4 45.2  
Segment Reconciling Items [Member] | Transmission And Distribution Utilities [Member]          
Reportable Segment Information          
Revenue, Net 26.9 19.9 46.9 39.4  
Segment Reconciling Items [Member] | AEP Transmission Holdco [Member]          
Reportable Segment Information          
Revenue, Net 194.3 120.4 322.7 179.7  
Segment Reconciling Items [Member] | Generation And Marketing [Member]          
Reportable Segment Information          
Revenue, Net 24.1 28.5 56.7 62.6  
Segment Reconciling Items [Member] | All Other [Member]          
Reportable Segment Information          
Revenue, Net [1] 14.2 18.0 30.1 36.1  
AEP Transmission Co [Member]          
Reportable Segment Information          
External Customers 44.0 34.1 63.3 56.1  
Sales to AEP Affiliates 185.4 119.0 318.8 176.6  
Total Revenues 229.4 153.1 382.1 232.7  
Interest Income - Affiliated 0.1 0.1 0.3 0.1  
Interest Expense 15.7 10.5 31.7 21.3  
Income Tax Expense 55.8 37.0 84.3 47.5  
Equity Earnings in State Transcos 0.0 0.0 0.0 0.0  
Net Income (Loss) 107.4 74.8 164.4 100.6  
Balance Sheet Information          
Total Property, Plant and Equipment 5,690.3   5,690.3   5,054.2
Accumulated Depreciation and Amortization 133.1   133.1   99.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,557.2   5,557.2   4,954.6
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 5,943.6   5,943.6   5,349.8
Long-term Debt 1,931.4   1,931.4   1,932.0
Total Long-term Debt Outstanding 1,931.4   1,931.4   1,932.0
AEP Transmission Co [Member] | State Transcos [Member]          
Reportable Segment Information          
External Customers 44.0 34.1 63.3 56.1  
Sales to AEP Affiliates 185.5 119.0 318.9 176.6  
Total Revenues 229.5 153.1 382.2 232.7  
Interest Income - Affiliated 0.0 0.0 0.1 0.0  
Interest Expense 15.9 10.5 31.7 21.3  
Income Tax Expense 55.7 37.0 84.1 47.5  
Equity Earnings in State Transcos 0.0 0.0 0.0 0.0  
Net Income (Loss) 107.4 74.8 164.2 100.6  
Balance Sheet Information          
Total Property, Plant and Equipment 5,690.3   5,690.3   5,054.2
Accumulated Depreciation and Amortization 133.1   133.1   99.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,557.2   5,557.2   4,954.6
Notes Receivable, Related Parties 0.0   0.0   0.0
Total Assets 5,924.5   5,924.5   5,337.5
Total Long-term Debt Outstanding 1,931.4   1,931.4   1,932.0
AEP Transmission Co [Member] | AEPTCo Parent [Member]          
Reportable Segment Information          
External 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 - Affiliated 19.4 13.9 38.5 27.8  
Interest Expense 19.1 13.9 38.3 27.7  
Income Tax Expense 0.1 0.0 0.2 0.0  
Equity Earnings in State Transcos 107.4 74.8 164.2 100.6  
Net Income (Loss) 107.4 74.8 164.4 100.6  
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 1,950.0   1,950.0   1,950.0
Total Assets 4,282.5   4,282.5   3,947.8
Total Long-term Debt Outstanding 1,950.0   1,950.0   1,950.0
AEP Transmission Co [Member] | Consolidation, Eliminations [Member]          
Reportable Segment Information          
External Customers 0.0 0.0 0.0 0.0  
Sales to AEP Affiliates (0.1) 0.0 (0.1) 0.0  
Total Revenues (0.1) 0.0 (0.1) 0.0  
Interest Income - Affiliated [4] (19.3) (13.8) (38.3) (27.7)  
Interest Expense [4] (19.3) (13.9) (38.3) (27.7)  
Income Tax Expense 0.0 0.0 0.0 0.0  
Equity Earnings in State Transcos [5] (107.4) (74.8) (164.2) (100.6)  
Net Income (Loss) [5] (107.4) $ (74.8) (164.2) $ (100.6)  
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] (1,950.0)   (1,950.0)   (1,950.0)
Total Assets [7] (4,263.4)   (4,263.4)   (3,935.5)
Total Long-term Debt Outstanding [6] $ (1,950.0)   $ (1,950.0)   $ (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 Notes Receivable from the State Transcos.