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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) subsidiary state plan shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 shares
Product Information [Line Items] |  |  |
Number of states in which entity operates | state | 11 |  |
Defined contribution plan, number of unfunded non-quality pension plans | plan | 2 |  |
Defined benefit plan, concentration limits, in excess of all equity investments, percentage | 5.00% |  |
Defined benefit plan, concentration limits, cash equivalents of investment manager's equity portfolio, percentage | 10.00% |  |
Securities loaned, fair value | $ | $ 60 | $ 62 |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares | 0 | 0 | 0
Minimum |  |  |
Product Information [Line Items] |  |  |
Securities loaned, collateralized percentage | 102.00% |  |
AEPTCo |  |  |
Product Information [Line Items] |  |  |
Number of wholly-owned transmissions subsidiaries | subsidiary | 7 |  |

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