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INVESTMENTS - Unrealized Gain (Loss) Recognized Related to Equity Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Equity Securities, FV-NI, Gain (Loss) $ 371 $ (236)
Equity Securities, FV-NI, Realized Gain (Loss) 52 7
Equity Securities, FV-NI, Unrealized Gain (Loss) $ 319 $ (243)