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FAIR VALUE MEASUREMENTS - Plan Assets within the Fair Value Hierarchy (Details) - EBP 002 - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 4,719,489,317 | $ 4,602,651,089
Subtotal Equities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 808,974,208 | 829,079,428
Corporate Stocks |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 554,966,516 | 557,042,541
AEP Stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 254,007,692 | 272,036,887
Subtotal Common/Collective Trusts |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 3,731,155,137 | 3,599,670,549
Mellon Capital Small Cap Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 169,951,861 | 179,341,271
Mellon Capital Mid Cap Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 459,321,305 | 456,261,518
Mellon Capital Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 1,429,311,150 | 1,298,414,738
Mellon Capital International Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 690,699,519 | 704,972,081
Mellon Capital Aggregate Bond Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 511,889,594 | 521,308,895
Mellon Capital Treasury Inflation-Protected Securities Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 24,183,840 | 24,749,151
JPMorgan Strategic Property Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 84,071,443 | 68,468,634
Mellon Capital Emerging Markets Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 65,013,298 | 60,252,437
William Blair Large Cap Growth I |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 214,753,054 |
Columbia Trust Focused Large Cap Growth Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value |  | 195,092,837
Sands Capital International Growth CIT |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 22,073,747 | 25,623,845
MetWest Total Return Bond Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 59,886,326 | 65,185,142
Self-Directed Brokerage Account |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 120,451,987 | 101,663,935
Registered Investment Companies |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 22,131,794 | 24,523,069
Money Market Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 36,776,191 | 47,714,108
Level 1 |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 975,138,188 | 987,619,486
Level 1 | Subtotal Equities |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 808,974,208 | 829,079,428
Level 1 | Corporate Stocks |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 554,966,516 | 557,042,541
Level 1 | AEP Stock |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 254,007,692 | 272,036,887
Level 1 | Self-Directed Brokerage Account |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 107,255,995 | 86,302,881
Level 1 | Registered Investment Companies |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 22,131,794 | 24,523,069
Level 1 | Money Market Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 36,776,191 | 47,714,108
Other |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 3,744,351,129 | 3,615,031,603
Other | Subtotal Common/Collective Trusts |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | 3,731,155,137 | 3,599,670,549
Other | Mellon Capital Small Cap Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 169,951,861 | $ 179,341,271
Redemption Notice Period | 1 day | 1 day
Other | Mellon Capital Mid Cap Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 459,321,305 | $ 456,261,518
Redemption Notice Period | 1 day | 1 day
Other | Mellon Capital Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 1,429,311,150 | $ 1,298,414,738
Redemption Notice Period | 1 day | 1 day
Other | Mellon Capital International Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 690,699,519 | $ 704,972,081
Redemption Notice Period | 1 day | 1 day
Other | Mellon Capital Aggregate Bond Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 511,889,594 | $ 521,308,895
Redemption Notice Period | 1 day | 1 day
Other | Mellon Capital Treasury Inflation-Protected Securities Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 24,183,840 | $ 24,749,151
Redemption Notice Period | 1 day | 1 day
Other | JPMorgan Strategic Property Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 84,071,443 | $ 68,468,634
Redemption Notice Period | 30 days | 30 days
Other | Mellon Capital Emerging Markets Stock Index Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 65,013,298 | $ 60,252,437
Redemption Notice Period | 1 day | 1 day
Other | William Blair Large Cap Growth I |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 214,753,054 |
Redemption Notice Period | 1 day |
Other | Columbia Trust Focused Large Cap Growth Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value |  | $ 195,092,837
Redemption Notice Period |  | 1 day
Other | Sands Capital International Growth CIT |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 22,073,747 | $ 25,623,845
Redemption Notice Period | 1 day | 1 day
Other | MetWest Total Return Bond Fund |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 59,886,326 | $ 65,185,142
Redemption Notice Period | 1 day | 1 day
Other | Self-Directed Brokerage Account |  |
EBP, Investment, Fair Value and NAV [Line Items] |  |
Total Assets Reflecting Investments at Fair Value | $ 13,195,992 | $ 15,361,054
Redemption Notice Period | 1 day | 1 day

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