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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reportable Segment Information                      
Revenues $ 3,614.7 $ 4,431.4 $ 3,826.7 $ 4,580.4 $ 3,819.1 $ 4,161.4 $ 3,900.6 $ 4,497.5 $ 16,453.2 $ 16,378.6 $ 14,813.5
Asset Impairments and Other Related Charges                 0.0 0.0 226.4
Depreciation and Amortization                 2,009.7 1,897.6 1,712.5
Interest and Investment Income                 7.9 7.4 57.9
Carrying Costs Income                 23.5 33.2 30.2
Interest Expense                 873.9 868.0 890.0
Income Tax Expense (Credit)                 919.6 902.6 677.7
Income from Continuing Operations 205.2 511.8 431.4 620.2 159.6 484.2 388.4 558.3 1,768.6 1,590.5 1,473.9
Income from Discontinued Operations, Net of Tax 265.5 [1] 7.8 (0.1) 10.5 31.9 10.2 2.7 2.7 283.7 47.5 10.3
NET INCOME (LOSS) 470.7 $ 519.6 $ 431.3 $ 630.7 191.5 [2] $ 494.4 $ 391.1 $ 561.0 2,052.3 1,638.0 1,484.2
Gross Property Additions                 4,513.3 4,194.8 3,648.4
Balance Sheet Information                      
Total Property, Plant and Equipment 65,481.4       63,605.9       65,481.4 63,605.9  
Accumulated Depreciation and Amortization 19,348.2       19,970.8       19,348.2 19,970.8  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 46,133.2       43,635.1 [3]       46,133.2 43,635.1 [3]  
Assets from Discontinued Operations         624.9         624.9  
Total Assets 61,683.1       59,544.6       61,683.1 59,544.6 56,321.0
Investments in Equity Method Investees 720.5       648.4       720.5 648.4  
Long-term Debt Due Within One Year - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt Due Within One Year 1,831.8       2,500.4       1,831.8 2,500.4  
Long-term Debt - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt 17,740.9       16,012.0       17,740.9 16,012.0  
Total Long-term Debt Outstanding 19,572.7       18,512.4 [4],[5]       19,572.7 18,512.4 [4],[5]  
Liabilities from Discontinued Operations [6]         434.8         434.8  
Consolidation Eliminations [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 0.0 (51.2) [7] (79.5) [7]
Revenues                 (1,116.5) (2,056.3) (3,489.1)
Asset Impairments and Other Related Charges                     0.0
Depreciation and Amortization [8]                 15.5 (43.7) (66.8)
Interest and Investment Income                 (15.3) (19.4) (21.8)
Carrying Costs Income                 0.1 0.0 0.0
Interest Expense [8]                 (27.2) (31.7) (33.5)
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                 (17.8) (28.0) (81.4)
Balance Sheet Information                      
Total Property, Plant and Equipment [8] (279.2)       (271.5)       (279.2) (271.5)  
Accumulated Depreciation and Amortization [8] (112.2)       (98.2)       (112.2) (98.2)  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [8] (167.0)       (173.3)       (167.0) (173.3)  
Assets from Discontinued Operations         0.0         0.0  
Total Assets [8],[9] (21,083.4)       (20,346.6)       (21,083.4) (20,346.6) (19,530.2)
Investments in Equity Method Investees 0.0       0.0       0.0 0.0  
Long-term Debt Due Within One Year - Affiliated 0.0       (197.0)       0.0 (197.0)  
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)       (249.2)       (52.2) (249.2)  
Liabilities from Discontinued Operations         0.0         0.0  
Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 (1,116.5) (2,005.1) (3,409.6)
Vertically Integrated Utilities [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 9,069.9 9,396.8 [10] 9,346.6
Revenues                 9,172.2 9,484.4 9,992.5
Asset Impairments and Other Related Charges                     72.1
Depreciation and Amortization                 1,062.6 1,033.0 941.5
Interest and Investment Income                 4.6 3.4 7.2
Carrying Costs Income                 11.8 6.7 13.8
Interest Expense                 517.4 525.5 540.1
Income Tax Expense (Credit)                 449.3 433.5 398.1
Income from Continuing Operations                 900.2 711.8 681.7
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 900.2 711.8 681.7
Gross Property Additions                 2,222.3 2,054.7 1,822.0
Balance Sheet Information                      
Total Property, Plant and Equipment 40,130.3       39,402.4       40,130.3 39,402.4  
Accumulated Depreciation and Amortization 12,335.0       12,772.8       12,335.0 12,772.8  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 27,795.3       26,629.6       27,795.3 26,629.6  
Assets from Discontinued Operations         0.0         0.0  
Total Assets 35,792.3       33,705.1       35,792.3 33,705.1 32,745.5
Investments in Equity Method Investees 31.9       26.2       31.9 26.2  
Long-term Debt Due Within One Year - Affiliated 0.0       111.0       0.0 111.0  
Long-term Debt Due Within One Year 935.4       1,352.4       935.4 1,352.4  
Long-term Debt - Affiliated 20.0       20.0       20.0 20.0  
Long-term Debt 9,833.0       8,589.2       9,833.0 8,589.2  
Total Long-term Debt Outstanding 10,788.4       10,072.6       10,788.4 10,072.6  
Liabilities from Discontinued Operations         0.0         0.0  
Vertically Integrated Utilities [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 102.3 87.6 [10] 645.9
Transmission and Distribution Companies [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 4,392.0 4,552.6 4,279.1
Revenues                 4,556.6 4,813.6 4,478.4
Asset Impairments and Other Related Charges                     0.0
Depreciation and Amortization                 686.2 657.8 591.3
Interest and Investment Income                 6.1 11.4 1.6
Carrying Costs Income                 11.8 26.5 16.3
Interest Expense                 275.8 279.9 291.0
Income Tax Expense (Credit)                 185.5 211.1 198.3
Income from Continuing Operations                 351.7 354.6 357.8
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 351.7 354.6 357.8
Gross Property Additions                 1,048.3 1,037.7 870.9
Balance Sheet Information                      
Total Property, Plant and Equipment 13,840.5       13,023.8       13,840.5 13,023.8  
Accumulated Depreciation and Amortization 3,529.2       3,480.7       3,529.2 3,480.7  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 10,311.3       9,543.1       10,311.3 9,543.1  
Assets from Discontinued Operations         0.0         0.0  
Total Assets 14,640.2       14,463.4       14,640.2 14,463.4 14,127.3
Investments in Equity Method Investees 0.9       1.1       0.9 1.1  
Long-term Debt Due Within One Year - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt Due Within One Year 824.7       405.2       824.7 405.2  
Long-term Debt - Affiliated 0.0       0.0       0.0 0.0  
Long-term Debt 4,776.8       5,224.2       4,776.8 5,224.2  
Total Long-term Debt Outstanding 5,601.5       5,629.4       5,601.5 5,629.4  
Liabilities from Discontinued Operations         0.0         0.0  
Transmission and Distribution Companies [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 164.6 261.0 199.3
AEP Transmission Holdco                      
Reportable Segment Information                      
Sales Revenue, Net                 100.6 73.9 26.8
Revenues                 329.2 191.9 77.7
Asset Impairments and Other Related Charges                     0.0
Depreciation and Amortization                 43.0 23.7 10.1
Interest and Investment Income                 0.2 0.0 0.0
Carrying Costs Income                 (0.2) 0.0 0.1
Interest Expense                 37.2 23.5 10.0
Income Tax Expense (Credit)                 91.3 62.9 29.0
Income from Continuing Operations                 192.7 150.8 79.4
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 192.7 150.8 79.4
Gross Property Additions                 1,121.3 948.3 842.6
Balance Sheet Information                      
Total Property, Plant and Equipment 3,977.6       2,714.2       3,977.6 2,714.2  
Accumulated Depreciation and Amortization 52.3       24.5       52.3 24.5  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 3,925.3       2,689.7       3,925.3 2,689.7  
Assets from Discontinued Operations         0.0         0.0  
Total Assets 5,012.1       3,570.0       5,012.1 3,570.0 2,241.5
Investments in Equity Method Investees 630.8       548.0       630.8 548.0  
Long-term Debt Due Within One Year - Affiliated 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 0.0       0.0       0.0 0.0  
Long-term Debt 1,648.4       1,147.5       1,648.4 1,147.5  
Total Long-term Debt Outstanding 1,648.4       1,147.5       1,648.4 1,147.5  
Liabilities from Discontinued Operations         0.0         0.0  
AEP Transmission Holdco | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 228.6 118.0 50.9
Generation and Marketing [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 2,866.7 2,384.3 [10] 1,208.0
Revenues                 3,412.7 3,849.6 3,665.2
Asset Impairments and Other Related Charges                     154.3
Depreciation and Amortization                 201.4 226.8 236.1
Interest and Investment Income                 2.8 4.7 2.1
Carrying Costs Income                 0.0 0.0 0.0
Interest Expense                 40.0 45.3 55.5
Income Tax Expense (Credit)                 194.6 179.3 112.2
Income from Continuing Operations                 366.0 367.4 227.9
Income from Discontinued Operations, Net of Tax                 0.0 0.0 0.0
NET INCOME (LOSS)                 366.0 367.4 227.9
Gross Property Additions                 134.3 164.9 185.2
Balance Sheet Information                      
Total Property, Plant and Equipment 7,461.3       8,394.3       7,461.3 8,394.3  
Accumulated Depreciation and Amortization 3,367.0       3,602.9       3,367.0 3,602.9  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET 4,094.3       4,791.4       4,094.3 4,791.4  
Assets from Discontinued Operations         0.0         0.0  
Total Assets 5,414.5       6,326.2       5,414.5 6,326.2 6,424.0
Investments in Equity Method Investees 0.1       0.1       0.1 0.1  
Long-term Debt Due Within One Year - Affiliated 0.0       86.0       0.0 86.0  
Long-term Debt Due Within One Year 71.6       740.0       71.6 740.0  
Long-term Debt - Affiliated 32.2       32.2       32.2 32.2  
Long-term Debt 639.5       214.8       639.5 214.8  
Total Long-term Debt Outstanding 743.3       1,073.0       743.3 1,073.0  
Liabilities from Discontinued Operations         0.0         0.0  
Generation and Marketing [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net                 546.0 1,465.3 [10] 2,457.2
All Other [Member]                      
Reportable Segment Information                      
Sales Revenue, Net [11]                 24.0 22.2 32.5
Revenues [11]                 99.0 95.4 88.8
Asset Impairments and Other Related Charges [11]                     0.0
Depreciation and Amortization [11]                 1.0 0.0 0.3
Interest and Investment Income [11]                 9.5 7.3 68.8
Carrying Costs Income [11]                 0.0 0.0 0.0
Interest Expense [11]                 30.7 25.5 26.9
Income Tax Expense (Credit) [11]                 (1.1) 15.8 (59.9)
Income from Continuing Operations [11]                 (42.0) 5.9 127.1
Income from Discontinued Operations, Net of Tax [11]                 283.7 47.5 10.3
NET INCOME (LOSS) [11]                 241.7 53.4 137.4
Gross Property Additions [11]                 4.9 17.2 9.1
Balance Sheet Information                      
Total Property, Plant and Equipment [11] 350.9       342.7       350.9 342.7  
Accumulated Depreciation and Amortization [11] 176.9       188.1       176.9 188.1  
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET [11] 174.0       154.6       174.0 154.6  
Assets from Discontinued Operations [11]         624.9         624.9  
Total Assets [11] 21,907.4       21,826.5       21,907.4 21,826.5 20,312.9
Investments in Equity Method Investees [11] 56.8       73.0       56.8 73.0  
Long-term Debt Due Within One Year - Affiliated [11] 0.0       0.0       0.0 0.0  
Long-term Debt Due Within One Year [11] 0.1       2.8       0.1 2.8  
Long-term Debt - Affiliated [11] 0.0       0.0       0.0 0.0  
Long-term Debt [11] 843.2       836.3       843.2 836.3  
Total Long-term Debt Outstanding [11] $ 843.3       839.1       843.3 839.1  
Liabilities from Discontinued Operations [11]         $ 434.8         434.8  
All Other [Member] | Segment Reconciling Items [Member]                      
Reportable Segment Information                      
Sales Revenue, Net [11]                 $ 75.0 $ 73.2 $ 56.3
[1] Includes sale of AEPRO (see Note 7).
[2] Includes termination of coal contract and a KPCo regulatory disallowance (see Note 4).
[3] Amount excludes $482 million of Property, Plant and Equipment - Net classified as Assets from Discontinued Operations on the balance sheet. See “AEPRO (Corporate and Other)” section of Note 7 for additional information.
[4] Amount excludes $83 million of Long-term Debt classified as Liabilities from Discontinued Operations on the balance sheet. See "AEPRO (Corporate and Other)" section of Note 7 for additional information.
[5] Amount excludes $83 million of Long-term Debt classified as Liabilities from Discontinued Operations on the balance sheet. See “AEPRO (Corporate and Other)” section of Note 7 for additional information.
[6] Amount includes debt related to AEPRO. See “AEPRO (Corporate and Other)” section of Note 7 for additional information.
[7] Reconciling Adjustments for External Customers primarily include eliminations as a result of corporate separation in Ohio.
[8] Includes eliminations due to an intercompany capital lease.
[9] 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.
[10] 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.
[11] 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.