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CAPITALIZATION - Narrative (Details) |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2023 USD ($) | Dec. 13, 2022 USD ($) $ / shares | Nov. 06, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Sep. 30, 2022 $ / shares | Jun. 30, 2022 $ / shares | Mar. 31, 2022 $ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2021 $ / shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2022 USD ($) subsidiary $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares shares | Nov. 29, 2022 USD ($) | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  | $ (1,605,000,000) | $ (1,199,000,000) |  |  |  | $ (1,605,000,000) |  |  |  | $ (1,199,000,000) | $ (1,605,000,000) |  |  |
Dividends declared (in dollars per share) | $ / shares |  | $ 0.39 |  |  |  |  |  |  |  |  |  |  | $ 1.56 | $ 1.56 | $ 1.56 |  |
Common stock dividends per share paid, in dollars per share | $ / shares |  |  |  |  | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.10 | $ 0.10 |  |  |  | $ 0.10 |  |  |  | $ 0.10 | $ 0.10 |  |  |
Preferred shares, outstanding (in shares) | shares |  |  |  | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |
Preference shares outstanding (in shares) | shares |  |  |  | 0 | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |
Number of subsidiaries that issued environmental control bonds | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Environmental control bonds outstanding |  |  |  | $ 274,000,000 | $ 247,000,000 |  |  |  | $ 274,000,000 |  |  |  | $ 247,000,000 | $ 274,000,000 |  |  |
Principal default amount specified in debt covenants |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  | 222,000,000 | $ 206,000,000 |  |  |  | $ 222,000,000 |  |  |  | $ 206,000,000 | $ 222,000,000 |  |  |
Common Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction | shares |  |  | 25,588,535 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  | $ 39.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment amount |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Registered Shareholders, Directors and Employees of Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based benefit plans (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 1,000,000 | 2,000,000 |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 445,000,000
AGC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |
WP | 5.29% First Mortgage Bond Due 2033 | First Mortgage Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Proceeds from issuance of FMB's |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.29% |
WP | 5.29% First Mortgage Bond Due 2033 | First Mortgage Bond | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of FMB's | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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