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FAIR VALUE MEASUREMENTS - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 04, 2023 USD ($) tradingDay | May 01, 2023 | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2022 USD ($) | Apr. 30, 2023 | Dec. 31, 2022 USD ($)
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Investments not required to be disclosed | $ |  |  | $ 364 |  | $ 364 |  |  | $ 351
Debt instrument, conversion rate |  |  |  |  | 0.021362 |  |  |
2026 Convertible Notes | Unsecured Debt |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Issuance interest rate |  |  |  |  |  |  | 4.00% |
FE | 4.00%, 1,300 Million Notes Maturity 2026 | Promissory Notes |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Face amount of debt | $ | $ 1,500 |  |  |  |  |  |  |
Issuance interest rate | 4.00% |  |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  |  | $ 46.81 |  | $ 46.81 |  |  |
Debt instrument, convertible, threshold trading days | 20 |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | 30 |  |  |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |  |
Debt instrument, convertible, business days | 5 |  |  |  |  |  |  |
Threshold trading days measurement period | 10 |  |  |  |  |  |  |
Debt instrument, measurement period percentage | 98.00% |  |  |  |  |  |  |
Debt instrument convertible premium |  | 0.20 |  |  |  |  |  |
Repurchase price, percentage |  | 1 |  |  |  |  |  |
Corporate-Owned Life Insurance |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on investments | $ |  |  | $ 3 | $ (16) | $ 10 | $ (22) |  |

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