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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value Inputs Assets Quantitative Information [Line Items]      
Change in purchased market risk benefit asset fair value $ 730   $ 1,100
AFS fixed maturities transferred from Level 3 to Level 2 489 $ 150  
AFS fixed maturities transferred from Level 2 to Level 3 $ 29 $ 191  
Percentage of total equity representing AFS fixed maturities transferred 15.80% 7.00%  
Nonrecurring | Level 3      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Investments, fair value $ 1,200   $ 1,000