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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Liabilities    
Restricted cash $ 26 $ 42
Recurring    
Assets    
Total assets 800 500
Liabilities    
Total liabilities 1 1
Net assets 799 499
Recurring | Derivative Liabilities | Derivative assets FTRs    
Liabilities    
Total liabilities 1 1
Level 1 | Recurring    
Assets    
Total assets 467 181
Liabilities    
Total liabilities 0 0
Net assets 467 181
Level 1 | Recurring | Derivative Liabilities | Derivative assets FTRs    
Liabilities    
Total liabilities 0 0
Level 2 | Recurring    
Assets    
Total assets 324 315
Liabilities    
Total liabilities 0 0
Net assets 324 315
Level 2 | Recurring | Derivative Liabilities | Derivative assets FTRs    
Liabilities    
Total liabilities 0 0
Level 3 | Recurring    
Assets    
Total assets 9 4
Liabilities    
Total liabilities 1 1
Net assets 8 3
Level 3 | Recurring | Derivative Liabilities | Derivative assets FTRs    
Liabilities    
Total liabilities 1 1
Derivative assets FTRs | Recurring | Derivative Assets    
Assets    
Total assets 9 4
Derivative assets FTRs | Level 1 | Recurring | Derivative Assets    
Assets    
Total assets 0 0
Derivative assets FTRs | Level 2 | Recurring | Derivative Assets    
Assets    
Total assets 0 0
Derivative assets FTRs | Level 3 | Recurring | Derivative Assets    
Assets    
Total assets 9 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 and municipal debt securities | Recurring    
Assets    
Total assets 277 275
U.S. state and municipal debt securities | Level 1 | Recurring    
Assets    
Total assets 0 0
U.S. state and municipal debt securities | Level 2 | Recurring    
Assets    
Total assets 277 275
U.S. state and municipal debt securities | Level 3 | Recurring    
Assets    
Total assets 0 0
Cash, cash equivalents and restricted cash | Recurring    
Assets    
Total assets 465 179
Cash, cash equivalents and restricted cash | Level 1 | Recurring    
Assets    
Total assets 465 179
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 47 40
Other | Level 1 | Recurring    
Assets    
Total assets 0 0
Other | Level 2 | Recurring    
Assets    
Total assets 47 40
Other | Level 3 | Recurring    
Assets    
Total assets $ 0 $ 0