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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Liabilities    
Restricted cash $ 43 $ 42
Recurring    
Assets    
Total assets 436 500
Liabilities    
Total liabilities 2 1
Net assets 434 499
Recurring | FTRs | Derivative Liabilities    
Liabilities    
Total liabilities 2 1
Recurring | FTRs | Derivative Assets    
Assets    
Total assets 10 4
Recurring | Equity securities    
Assets    
Total assets 2 2
Recurring | U.S. state and municipal debt securities    
Assets    
Total assets 271 275
Recurring | Cash, cash equivalents and restricted cash    
Assets    
Total assets 103 179
Recurring | Other    
Assets    
Total assets 50 40
Recurring | Level 1    
Assets    
Total assets 105 181
Liabilities    
Total liabilities 0 0
Net assets 105 181
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 and municipal debt securities    
Assets    
Total assets 0 0
Recurring | Level 1 | Cash, cash equivalents and restricted cash    
Assets    
Total assets 103 179
Recurring | Level 1 | Other    
Assets    
Total assets 0 0
Recurring | Level 2    
Assets    
Total assets 321 315
Liabilities    
Total liabilities 0 0
Net assets 321 315
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 and municipal debt securities    
Assets    
Total assets 271 275
Recurring | Level 2 | Cash, cash equivalents and restricted cash    
Assets    
Total assets 0 0
Recurring | Level 2 | Other    
Assets    
Total assets 50 40
Recurring | Level 3    
Assets    
Total assets 10 4
Liabilities    
Total liabilities 2 1
Net assets 8 3
Recurring | Level 3 | FTRs | Derivative Liabilities    
Liabilities    
Total liabilities 2 1
Recurring | Level 3 | FTRs | Derivative Assets    
Assets    
Total assets 10 4
Recurring | Level 3 | Equity securities    
Assets    
Total assets 0 0
Recurring | Level 3 | U.S. state and municipal 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