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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Liabilities    
Restricted cash $ 42 $ 46
Recurring    
Assets    
Total assets 500 525
Liabilities    
Total liabilities (1) (2)
Net assets (liabilities) 499 523
Recurring | FTRs | Derivative Liabilities    
Liabilities    
Total liabilities (1) (2)
Recurring | FTRs | Derivative Assets    
Assets    
Total assets 4 11
Recurring | Equity securities    
Assets    
Total assets 2 2
Recurring | U.S. state debt securities    
Assets    
Total assets 275 266
Recurring | Cash, cash equivalents and restricted cash    
Assets    
Total assets 179 206
Recurring | Other    
Assets    
Total assets 40 40
Recurring | Level 1    
Assets    
Total assets 181 208
Liabilities    
Total liabilities 0 0
Net assets (liabilities) 181 208
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 179 206
Recurring | Level 1 | Other    
Assets    
Total assets 0 0
Recurring | Level 2    
Assets    
Total assets 315 306
Liabilities    
Total liabilities 0 0
Net assets (liabilities) 315 306
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 275 266
Recurring | Level 2 | Cash, cash equivalents and restricted cash    
Assets    
Total assets 0 0
Recurring | Level 2 | Other    
Assets    
Total assets 40 40
Recurring | Level 3    
Assets    
Total assets 4 11
Liabilities    
Total liabilities (1) (2)
Net assets (liabilities) 3 9
Recurring | Level 3 | FTRs | Derivative Liabilities    
Liabilities    
Total liabilities (1) (2)
Recurring | Level 3 | FTRs | Derivative Assets    
Assets    
Total assets 4 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