XML 134 R65.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Benefit Plans 2 (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 4,118.2 | $ 4,124.7 | $ 5,352.9
Year End Allocation |  |  |  |
Total |  | 100.00% | 100.00% |
Pension Plan [Member] | AEP Texas Inc. [Member] |  |  |  |
Allocated Assets of Investments |  | 8.10% | 8.10% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 332.7 | $ 335.1 | 444.9
Pension Plan [Member] | Appalachian Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 13.40% | 12.90% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 549.8 | $ 531.7 | 683.3
Pension Plan [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 13.40% | 12.90% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 550.6 | $ 533.7 | 681.5
Pension Plan [Member] | Ohio Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 10.20% | 9.90% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 419.5 | $ 406.4 | 524.8
Pension Plan [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |
Allocated Assets of Investments |  | 5.40% | 5.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 222.7 | $ 218.5 | 286.2
Pension Plan [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 5.50% | 5.60% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 227.5 | $ 231.3 | 308.3
Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 1,673.3 | $ 1,549.3 | 2,044.3
Year End Allocation |  |  |  |
Total |  | 100.00% | 100.00% |
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] |  |  |  |
Allocated Assets of Investments |  | 8.20% | 8.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 137.5 | $ 128.3 | 168.8
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 14.50% | 14.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 243.0 | $ 228.6 | 302.3
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 12.20% | 12.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 204.6 | $ 190.5 | 248.7
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 10.60% | 10.70% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 177.8 | $ 166.2 | 220.0
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |
Allocated Assets of Investments |  | 5.40% | 5.50% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 90.2 | $ 85.4 | 114.0
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 6.60% | 6.60% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 111.1 | $ 103.0 | $ 136.6
Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 1,056.6 | 1,173.3 |
Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 274.3 | 300.9 |
Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 809.4 | 745.4 |
Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 897.8 | 765.3 |
Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 2,252.1 | 2,206.0 |
Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 501.2 | 483.1 |
Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.1 | 0.0 |
Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Equity Securities [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 1,222.0 | $ 1,125.9 |
Year End Allocation |  |  |  |
Total | [1] | 29.70% | 27.30% |
Equity Securities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 960.6 | $ 848.2 |
Year End Allocation |  |  |  |
Total |  | 57.40% | 54.70% |
Equity Securities [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 420.9 | $ 379.9 |
Equity Securities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 131.6 | 169.1 |
Equity Securities [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 801.1 | 746.0 |
Equity Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 829.0 | 679.1 |
Equity Securities [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Equity Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Equity Securities [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Equity Securities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 411.3 | $ 347.6 |
Year End Allocation |  |  |  |
Total | [1] | 10.00% | 8.40% |
Domestic [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 540.6 | $ 414.1 |
Year End Allocation |  |  |  |
Total |  | 32.30% | 26.70% |
Domestic [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Domestic [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 411.3 | 347.6 |
Domestic [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 540.6 | 414.1 |
Domestic [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Domestic [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Domestic [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 389.8 | $ 398.4 |
Year End Allocation |  |  |  |
Total | [1] | 9.50% | 9.70% |
International [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 288.4 | $ 265.0 |
Year End Allocation |  |  |  |
Total |  | 17.20% | 17.10% |
International [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
International [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 389.8 | 398.4 |
International [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 288.4 | 265.0 |
International [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
International [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
International [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Common Collective Trusts [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | $ 420.9 | $ 379.9 |
Year End Allocation |  |  |  |
Total | [1],[2] | 10.20% | 9.20% |
Common Collective Trusts [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 131.6 | $ 169.1 |
Year End Allocation |  |  |  |
Total | [3] | 7.90% | 10.90% |
Common Collective Trusts [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | $ 420.9 | $ 379.9 |
Common Collective Trusts [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 131.6 | 169.1 |
Common Collective Trusts [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Fixed Income [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 2,209.4 | $ 2,140.5 |
Year End Allocation |  |  |  |
Total | [1] | 53.60% | 51.90% |
Fixed Income [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 538.5 | $ 509.4 |
Year End Allocation |  |  |  |
Total |  | 32.20% | 33.00% |
Fixed Income [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Fixed Income [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 146.7 | 120.3 |
Fixed Income [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 8.3 | (0.6) |
Fixed Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 42.9 | 63.0 |
Fixed Income [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 2,201.1 | 2,141.1 |
Fixed Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 348.9 | 326.1 |
Fixed Income [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Fixed Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 146.7 | $ 120.3 |
Year End Allocation |  |  |  |
Total | [3] | 8.80% | 7.80% |
Common Collective Trust - Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 146.7 | $ 120.3 |
Common Collective Trust - Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 1,107.5 | $ 1,070.8 |
Year End Allocation |  |  |  |
Total | [1] | 26.90% | 26.00% |
United States Government and Agency Securities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 164.7 | $ 155.9 |
Year End Allocation |  |  |  |
Total |  | 9.80% | 10.10% |
United States Government and Agency Securities [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
United States Government and Agency Securities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 8.3 | (0.6) |
United States Government and Agency Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 1.4 | 0.1 |
United States Government and Agency Securities [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 1,099.2 | 1,071.4 |
United States Government and Agency Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 163.3 | 155.8 |
United States Government and Agency Securities [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 894.8 | $ 891.7 |
Year End Allocation |  |  |  |
Total | [1] | 21.70% | 21.60% |
Corporate Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 149.0 | $ 141.5 |
Year End Allocation |  |  |  |
Total |  | 8.90% | 9.10% |
Corporate Debt [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Corporate Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Corporate Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 894.8 | 891.7 |
Corporate Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 149.0 | 141.5 |
Corporate Debt [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Corporate Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 167.1 | $ 140.2 |
Year End Allocation |  |  |  |
Total | [1] | 4.10% | 3.40% |
Foreign Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 28.6 | $ 21.0 |
Year End Allocation |  |  |  |
Total |  | 1.70% | 1.40% |
Foreign Debt [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Foreign Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Foreign Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 167.1 | 140.2 |
Foreign Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 28.6 | 21.0 |
Foreign Debt [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Foreign Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
State and Local Government [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 38.7 | $ 37.0 |
Year End Allocation |  |  |  |
Total | [1] | 0.90% | 0.90% |
State and Local Government [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 49.3 | $ 70.7 |
Year End Allocation |  |  |  |
Total |  | 3.00% | 4.60% |
State and Local Government [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
State and Local Government [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
State and Local Government [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
State and Local Government [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 41.5 | 62.9 |
State and Local Government [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 38.7 | 37.0 |
State and Local Government [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 7.8 | 7.8 |
State and Local Government [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
State and Local Government [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Other - Asset Backed [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 1.3 | $ 0.8 |
Year End Allocation |  |  |  |
Total | [1] | 0.00% | 0.00% |
Other - Asset Backed [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.2 |  |
Year End Allocation |  |  |  |
Total |  | 0.00% |  |
Other - Asset Backed [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Other - Asset Backed [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 |  |
Other - Asset Backed [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Other - Asset Backed [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 |  |
Other - Asset Backed [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 1.3 | 0.8 |
Other - Asset Backed [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.2 |  |
Other - Asset Backed [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Other - Asset Backed [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 |  |
Infrastructure [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 101.4 | $ 109.2 |
Year End Allocation |  |  |  |
Total | [2] | 2.50% | 2.60% |
Infrastructure [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 101.4 | $ 109.2 |
Infrastructure [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Infrastructure [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Infrastructure [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 239.3 | $ 276.9 |
Year End Allocation |  |  |  |
Total | [2] | 5.80% | 6.70% |
Real Estate [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 239.3 | $ 276.9 |
Real Estate [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 241.8 | $ 319.7 |
Year End Allocation |  |  |  |
Total | [2] | 5.80% | 7.80% |
Alternative Investments [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 241.8 | $ 319.7 |
Alternative Investments [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Trusted Owned Life Insurance [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 152.3 | $ 157.0 |
Year End Allocation |  |  |  |
Total |  | 9.10% | 10.10% |
Trusted Owned Life Insurance [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
Trusted Owned Life Insurance [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Trusted Owned Life Insurance [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 152.3 | 157.0 |
Trusted Owned Life Insurance [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International Equities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 22.3 | $ 46.7 |
Year End Allocation |  |  |  |
Total |  | 1.30% | 3.00% |
International Equities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
International Equities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International Equities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 22.3 | 46.7 |
International Equities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Bonds [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 130.0 | $ 110.3 |
Year End Allocation |  |  |  |
Total |  | 7.80% | 7.10% |
United States Bonds [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
United States Bonds [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Bonds [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 130.0 | 110.3 |
United States Bonds [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 84.8 | $ 123.2 |
Year End Allocation |  |  |  |
Total | [2] | 2.10% | 3.00% |
Cash and Cash Equivalents [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 28.8 | $ 29.9 |
Year End Allocation |  |  |  |
Total | [3] | 1.70% | 1.90% |
Cash and Cash Equivalents [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 33.8 | $ 58.3 |
Cash and Cash Equivalents [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 2.9 | 6.7 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 25.9 | 23.2 |
Cash and Cash Equivalents [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 51.0 | 64.9 |
Cash and Cash Equivalents [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | $ 19.5 | $ 29.3 |
Year End Allocation |  |  |  |
Total | [4] | 0.50% | 0.70% |
Other - Pending Transactions and Accrued Income [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | $ (6.9) | $ 4.8 |
Year End Allocation |  |  |  |
Total | [5] | (0.40%) | 0.30% |
Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | $ 19.4 | $ 29.3 |
Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | (6.9) | 4.8 |
Other - Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.1 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | $ 0.0 | $ 0.0 |
[1] | Includes investment securities loaned to borrowers under the securities lending program. See the “Investments Held in Trust for Future Liabilities” section of Note 1 for additional information.
[2] | Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share.
[3] | Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share.
[4] | Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.
[5] | Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.

X
- Definition Percentage of investments that are allocated to the Registrant Subsidiary. + References No definition available. + Details
Name: | aep_AllocatedAssetsofInvestments
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Pension and Other Postretirement Plans' Assets Percentage. + References No definition available. + Details
Name: | aep_PensionAndOtherPostretirementPlansAssetsPercentageAbstract
Namespace Prefix: | aep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanInformationAboutPlanAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AEPTexasInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AppalachianPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_IndianaMichiganPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_OhioPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_PublicServiceCoOfOklahomaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_SouthwesternElectricPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_CommonCollectiveTrustDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_ForeignDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_InfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_AlternativeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_TrustedOwnedLifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_InternationalEquitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USTreasuryBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=aep_OtherPendingTransactionsAndAccruedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |