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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reportable Segment Information                      
Revenues $ 3,790.1 $ 4,652.2 $ 3,892.9 $ 4,044.9 $ 3,614.7 $ 4,431.4 $ 3,826.7 $ 4,580.4 $ 16,380.1 $ 16,453.2 $ 16,378.6
Asset Impairments and Other Related Charges                 2,267.8 0.0 0.0
Depreciation and Amortization                 1,962.3 2,009.7 1,897.6
Interest and Investment Income                 16.3 7.9 7.4
Carrying Costs Income                 16.2 23.5 33.2
Interest Expense                 877.2 873.9 868.0
Income Tax Expense (Credit)                 (73.7) 919.6 902.6
Income from Continuing Operations 375.2 (764.2) [1] 506.4 503.1 205.2 511.8 431.4 620.2 620.5 1,768.6 1,590.5
Income from Discontinued Operations, Net of Tax     (2.5) [2]   265.5 [3] 7.8 (0.1) 10.5 (2.5) 283.7 47.5
NET INCOME (LOSS) 375.2 $ (764.2) [1] $ 503.9 $ 503.1 470.7 $ 519.6 $ 431.3 $ 630.7 618.0 2,052.3 1,638.0
Gross Property Additions                 4,889.0 4,513.3 4,194.8
Balance Sheet Information                      
Total Property, Plant and Equipment 62,036.6       65,481.4       62,036.6 65,481.4  
Accumulated Depreciation and Amortization 16,397.3       19,348.2       16,397.3 19,348.2  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 45,639.3 [4]       46,133.2       45,639.3 [4] 46,133.2  
Assets Held for Sale 1,951.2               1,951.2    
Total Assets 63,467.7       61,683.1       63,467.7 61,683.1 59,544.6
Investments in Equity Method Investees 809.4       720.5       809.4 720.5  
Long-term Debt Due Within One Year 2,878.0       1,831.8       2,878.0 1,831.8  
Long-term Debt - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt 17,378.4       17,740.9       17,378.4 17,740.9  
Total Long-term Debt Outstanding 20,256.4       19,572.7 [5]       20,256.4 19,572.7 [5]  
Liabilities Held for Sale 235.9               235.9    
Consolidation Eliminations [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 0.0 0.0 (51.2) [6]
Revenues                 (738.1) (1,116.5) (2,056.3)
Asset Impairments and Other Related Charges                 0.0    
Depreciation and Amortization [7]                 16.7 15.5 (43.7)
Interest and Investment Income                 (16.9) (15.3) (19.4)
Carrying Costs Income                 (14.0) 0.1 0.0
Interest Expense [7]                 (28.4) (27.2) (31.7)
Income Tax Expense (Credit)                 0.0 0.0 0.0
Income from Continuing Operations                 0.0 0.0 0.0
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 0.0 0.0 0.0
Gross Property Additions                 (18.1) (17.8) (28.0)
Balance Sheet Information                      
Total Property, Plant and Equipment [7] (353.5)       (279.2)       (353.5) (279.2)  
Accumulated Depreciation and Amortization [7] (184.0)       (112.2)       (184.0) (112.2)  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [7] (169.5)       (167.0)       (169.5) (167.0)  
Assets Held for Sale 0.0               0.0    
Total Assets [7],[8] (18,888.7)       (19,573.0)       (18,888.7) (19,573.0) (19,094.2)
Investments in Equity Method Investees 0.0       0.0       0.0 0.0  
Long-term Debt Due Within One Year 0.0       0.0       0.0 0.0  
Long-term Debt - Affiliated (52.2)       (52.2)       (52.2) (52.2)  
Long-term Debt 0.0       0.0       0.0 0.0  
Total Long-term Debt Outstanding (52.2)       (52.2)       (52.2) (52.2)  
Liabilities Held for Sale 0.0               0.0    
Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 (738.1) (1,116.5) (2,005.1)
Vertically Integrated Utilities [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 9,012.4 9,069.9 9,396.8 [9]
Revenues                 9,091.9 9,172.2 9,484.4
Asset Impairments and Other Related Charges                 10.5    
Depreciation and Amortization                 1,073.8 1,062.6 1,033.0
Interest and Investment Income                 4.8 4.6 3.4
Carrying Costs Income                 10.5 11.8 6.7
Interest Expense                 522.1 517.4 525.5
Income Tax Expense (Credit)                 397.3 449.3 433.5
Income from Continuing Operations                 984.0 900.2 711.8
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 984.0 900.2 711.8
Gross Property Additions                 2,237.0 2,222.3 2,054.7
Balance Sheet Information                      
Total Property, Plant and Equipment 41,552.6       40,130.3       41,552.6 40,130.3  
Accumulated Depreciation and Amortization 12,596.7       12,335.0       12,596.7 12,335.0  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 28,955.9       27,795.3       28,955.9 27,795.3  
Assets Held for Sale 0.0               0.0    
Total Assets 37,428.3       35,792.3       37,428.3 35,792.3 33,705.1
Investments in Equity Method Investees 41.2       31.9       41.2 31.9  
Long-term Debt Due Within One Year 1,519.9       935.4       1,519.9 935.4  
Long-term Debt - Affiliated 20.0       20.0       20.0 20.0  
Long-term Debt 10,353.3       9,833.0       10,353.3 9,833.0  
Total Long-term Debt Outstanding 11,893.2       10,788.4       11,893.2 10,788.4  
Liabilities Held for Sale 0.0               0.0    
Vertically Integrated Utilities [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 79.5 102.3 87.6 [9]
Transmission and Distribution Companies [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 4,328.3 4,392.0 4,552.6
Revenues                 4,422.4 4,556.6 4,813.6
Asset Impairments and Other Related Charges                 0.0    
Depreciation and Amortization                 649.9 686.4 657.8
Interest and Investment Income                 14.8 6.4 10.1
Carrying Costs Income                 20.0 11.8 26.5
Interest Expense                 256.9 276.2 280.3
Income Tax Expense (Credit)                 205.1 185.5 211.7
Income from Continuing Operations                 482.1 352.4 352.2
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 482.1 352.4 352.2
Gross Property Additions                 1,058.3 1,048.4 1,037.7
Balance Sheet Information                      
Total Property, Plant and Equipment 14,762.2       13,840.5       14,762.2 13,840.5  
Accumulated Depreciation and Amortization 3,655.0       3,529.2       3,655.0 3,529.2  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 11,107.2       10,311.3       11,107.2 10,311.3  
Assets Held for Sale 0.0               0.0    
Total Assets 14,802.4       14,795.0       14,802.4 14,795.0 14,524.6
Investments in Equity Method Investees 1.2       0.9       1.2 0.9  
Long-term Debt Due Within One Year 309.4       824.7       309.4 824.7  
Long-term Debt - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt 4,672.2       4,776.8       4,672.2 4,776.8  
Total Long-term Debt Outstanding 4,981.6       5,601.5       4,981.6 5,601.5  
Liabilities Held for Sale 0.0               0.0    
Transmission and Distribution Companies [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 94.1 164.6 261.0
AEP Transmission Holdco                      
Reportable Segment Information                      
Sales Revenue, Net                 145.9 100.6 73.9
Revenues                 512.8 329.2 191.9
Asset Impairments and Other Related Charges                 0.0    
Depreciation and Amortization                 67.1 43.0 23.7
Interest and Investment Income                 0.4 0.2 0.0
Carrying Costs Income                 (0.3) (0.2) 0.0
Interest Expense                 50.3 37.2 23.5
Income Tax Expense (Credit)                 134.1 91.3 62.9
Income from Continuing Operations                 269.3 192.7 150.8
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 269.3 192.7 150.8
Gross Property Additions                 1,265.8 1,121.3 948.3
Balance Sheet Information                      
Total Property, Plant and Equipment 5,354.0       3,977.6       5,354.0 3,977.6  
Accumulated Depreciation and Amortization 101.4       52.3       101.4 52.3  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 5,252.6       3,925.3       5,252.6 3,925.3  
Assets Held for Sale 0.0               0.0    
Total Assets 6,384.8       5,012.1       6,384.8 5,012.1 3,570.0
Investments in Equity Method Investees 742.0       630.8       742.0 630.8  
Long-term Debt Due Within One Year 0.0       0.0       0.0 0.0  
Long-term Debt - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt 2,055.7       1,648.4       2,055.7 1,648.4  
Total Long-term Debt Outstanding 2,055.7       1,648.4       2,055.7 1,648.4  
Liabilities Held for Sale 0.0               0.0    
AEP Transmission Holdco | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 366.9 228.6 118.0
Generation and Marketing [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 2,858.7 2,866.7 2,384.3 [9]
Revenues                 2,986.0 3,412.7 3,849.6
Asset Impairments and Other Related Charges                 2,257.3    
Depreciation and Amortization                 154.6 201.4 226.8
Interest and Investment Income                 1.4 2.8 4.7
Carrying Costs Income                 0.0 0.0 0.0
Interest Expense                 35.8 40.0 45.3
Income Tax Expense (Credit)                 (666.5) 194.6 179.3
Income from Continuing Operations                 (1,198.0) 366.0 367.4
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 (1,198.0) 366.0 367.4
Gross Property Additions                 336.2 134.3 164.9
Balance Sheet Information                      
Total Property, Plant and Equipment 364.7       7,461.3       364.7 7,461.3  
Accumulated Depreciation and Amortization 42.2       3,367.0       42.2 3,367.0  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 322.5       4,094.3       322.5 4,094.3  
Assets Held for Sale 1,951.2               1,951.2    
Total Assets 3,386.1       5,414.5       3,386.1 5,414.5 6,326.2
Investments in Equity Method Investees 0.1       0.1       0.1 0.1  
Long-term Debt Due Within One Year 500.1       71.6       500.1 71.6  
Long-term Debt - Affiliated 32.2       32.2       32.2 32.2  
Long-term Debt 0.0       639.5       0.0 639.5  
Total Long-term Debt Outstanding 532.3       743.3       532.3 743.3  
Liabilities Held for Sale 235.9               235.9    
Generation and Marketing [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 127.3 546.0 1,465.3 [9]
All Other [Member]                      
Reportable Segment Information                      
Sales Revenue, Net [10]                 34.8 24.0 22.2
Revenues [10]                 105.1 99.0 95.4
Asset Impairments and Other Related Charges [10]                 0.0    
Depreciation and Amortization [10]                 0.2 0.8 0.0
Interest and Investment Income [10]                 11.8 9.2 8.6
Carrying Costs Income [10]                 0.0 0.0 0.0
Interest Expense [10]                 40.5 30.3 25.1
Income Tax Expense (Credit) [10]                 (143.7) (1.1) 15.2
Income from Continuing Operations [10]                 83.1 (42.7) 8.3
Income from Discontinued Operations, Net of Tax [10]                 (2.5) 283.7 47.5
NET INCOME (LOSS) [10]                 80.6 241.0 55.8
Gross Property Additions [10]                 9.8 4.8 17.2
Balance Sheet Information                      
Total Property, Plant and Equipment [10] 356.6       350.9       356.6 350.9  
Accumulated Depreciation and Amortization [10] 186.0       176.9       186.0 176.9  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [10] 170.6       174.0       170.6 174.0  
Assets Held for Sale [10] 0.0               0.0    
Total Assets [10] 20,354.8       20,242.2       20,354.8 20,242.2 20,512.9
Investments in Equity Method Investees [10] 24.9       56.8       24.9 56.8  
Long-term Debt Due Within One Year [10] 548.6       0.1       548.6 0.1  
Long-term Debt - Affiliated [10] 0.0       0.0       0.0 0.0  
Long-term Debt [10] 297.2       843.2       297.2 843.2  
Total Long-term Debt Outstanding [10] 845.8       $ 843.3       845.8 843.3  
Liabilities Held for Sale [10] $ 0.0               0.0    
All Other [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net [10]                 $ 70.3 $ 75.0 $ 73.2
[1] Includes impairments for Merchant Generating Assets (see Note 7).
[2] Includes final accounting adjustment for sale of AEPRO (see Note 7).
[3] Includes sale of AEPRO (see Note 7).
[4] Amount excludes $1.8 billion of Property, Plant and Equipment - Net classified as Assets Held for Sale on the balance sheet. See “Gavin, Waterford, Darby and Lawrenceburg Plants (Generation & Marketing Segment)” section of Note 7 for additional information.
[5] .
[6] Reconciling Adjustments for External Customers primarily include eliminations as a result of corporate separation in Ohio.
[7] Includes eliminations due to an intercompany capital lease.
[8] 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.
[9] Includes the impact of the corporate separation of OPCo’s generation assets and liabilities that took effect December 31, 2013, as well as the impact of the termination of the Interconnection Agreement effective January 1, 2014.
[10] 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 discontinued operations of AEPRO and other nonallocated costs.