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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Liabilities |  |
Restricted cash | $ 26 | $ 46
Recurring |  |
Assets |  |
Total assets | 456 | 525
Liabilities |  |
Total liabilities | (3) | (2)
Net assets | 453 | 523
Recurring | FTRs | Derivative Liabilities |  |
Liabilities |  |
Total liabilities | (3) | (2)
Recurring | FTRs | Derivative Assets |  |
Assets |  |
Total assets | 10 | 11
Recurring | Equity securities |  |
Assets |  |
Total assets | 2 | 2
Recurring | U.S. state debt securities |  |
Assets |  |
Total assets | 259 | 266
Recurring | Cash, cash equivalents and restricted cash |  |
Assets |  |
Total assets | 144 | 206
Recurring | Other |  |
Assets |  |
Total assets | 41 | 40
Recurring | Level 1 |  |
Assets |  |
Total assets | 146 | 208
Liabilities |  |
Total liabilities | 0 | 0
Net assets | 146 | 208
Recurring | Level 1 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Total liabilities | 0 | 0
Recurring | Level 1 | FTRs | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 1 | Equity securities |  |
Assets |  |
Total assets | 2 | 2
Recurring | Level 1 | U.S. state debt securities |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 1 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Total assets | 144 | 206
Recurring | Level 1 | Other |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 2 |  |
Assets |  |
Total assets | 300 | 306
Liabilities |  |
Total liabilities | 0 | 0
Net assets | 300 | 306
Recurring | Level 2 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Total liabilities | 0 | 0
Recurring | Level 2 | FTRs | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 2 | Equity securities |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 2 | U.S. state debt securities |  |
Assets |  |
Total assets | 259 | 266
Recurring | Level 2 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 2 | Other |  |
Assets |  |
Total assets | 41 | 40
Recurring | Level 3 |  |
Assets |  |
Total assets | 10 | 11
Liabilities |  |
Total liabilities | (3) | (2)
Net assets | 7 | 9
Recurring | Level 3 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Total liabilities | (3) | (2)
Recurring | Level 3 | FTRs | Derivative Assets |  |
Assets |  |
Total assets | 10 | 11
Recurring | Level 3 | Equity securities |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 3 | U.S. state debt securities |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 3 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Total assets | 0 | 0
Recurring | Level 3 | Other |  |
Assets |  |
Total assets | $ 0 | $ 0

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