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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