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INVESTMENTS - Pledged Investments (Narrative) (Details) - USD ($)
$ in Billions
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties $ 10.0 $ 10.5
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities $ 2.9 $ 2.9