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INVESTMENTS - Pledged Investments (Details) - USD ($)
$ in Billions
Sep. 30, 2022
Dec. 31, 2021
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 $ 7.9 $ 8.7
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities $ 1.2 $ 1.8