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SHORT-TERM AND LONG-TERM DEBT - Short-term Debt Narrative (Details) - AB commercial paper - AB commercial paper - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Short-term Debt [Line Items]    
Short-term debt including accrued interest $ 254,000,000 $ 0
Debt instrument, stated percentage 5.40%  
Average outstanding balance $ 268,000,000 $ 190,000,000
Weighted average interest rate over period 5.20% 1.50%