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INVESTMENTS - Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Equity Securities, FV-NI [Line Items]    
Fair Value $ 1,149 $ 1,603
Yen-denominated    
Equity Securities, FV-NI [Line Items]    
Fair Value 636 744
Dollar-denominated    
Equity Securities, FV-NI [Line Items]    
Fair Value 466 817
Other currencies    
Equity Securities, FV-NI [Line Items]    
Fair Value $ 47 $ 42