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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities |  |
Restricted cash | $ 43 | $ 42
Recurring |  |
Assets |  |
Total assets | 484 | 500
Liabilities |  |
Total liabilities | 0 | (1)
Net assets (liabilities) | 484 | 499
Recurring | Derivative Liabilities | FTRs |  |
Liabilities |  |
Total liabilities | 0 | (1)
Level 1 | Recurring |  |
Assets |  |
Total assets | 156 | 181
Liabilities |  |
Total liabilities | 0 | 0
Net assets (liabilities) | 156 | 181
Level 1 | Recurring | Derivative Liabilities | FTRs |  |
Liabilities |  |
Total liabilities | 0 | 0
Level 2 | Recurring |  |
Assets |  |
Total assets | 321 | 315
Liabilities |  |
Total liabilities | 0 | 0
Net assets (liabilities) | 321 | 315
Level 2 | Recurring | Derivative Liabilities | FTRs |  |
Liabilities |  |
Total liabilities | 0 | 0
Level 3 | Recurring |  |
Assets |  |
Total assets | 7 | 4
Liabilities |  |
Total liabilities | 0 | (1)
Net assets (liabilities) | 7 | 3
Level 3 | Recurring | Derivative Liabilities | FTRs |  |
Liabilities |  |
Total liabilities | 0 | (1)
FTRs | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 7 | 4
FTRs | Level 1 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
FTRs | Level 2 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 0 | 0
FTRs | Level 3 | Recurring | Derivative Assets |  |
Assets |  |
Total assets | 7 | 4
Equity securities | Recurring |  |
Assets |  |
Total assets | 2 | 2
Equity securities | Level 1 | Recurring |  |
Assets |  |
Total assets | 2 | 2
Equity securities | Level 2 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Equity securities | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
U.S. state debt securities | Recurring |  |
Assets |  |
Total assets | 276 | 275
U.S. state debt securities | Level 1 | Recurring |  |
Assets |  |
Total assets | 0 | 0
U.S. state debt securities | Level 2 | Recurring |  |
Assets |  |
Total assets | 276 | 275
U.S. state debt securities | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Cash, cash equivalents and restricted cash | Recurring |  |
Assets |  |
Total assets | 154 | 179
Cash, cash equivalents and restricted cash | Level 1 | Recurring |  |
Assets |  |
Total assets | 154 | 179
Cash, cash equivalents and restricted cash | Level 2 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Cash, cash equivalents and restricted cash | Level 3 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Other | Recurring |  |
Assets |  |
Total assets | 45 | 40
Other | Level 1 | Recurring |  |
Assets |  |
Total assets | 0 | 0
Other | Level 2 | Recurring |  |
Assets |  |
Total assets | 45 | 40
Other | Level 3 | Recurring |  |
Assets |  |
Total assets | $ 0 | $ 0

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