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INVESTMENTS - Equity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Equity Securities, FV-NI [Line Items]    
Fair Value $ 1,415 $ 1,603
Yen-denominated    
Equity Securities, FV-NI [Line Items]    
Fair Value 711 744
Dollar-denominated    
Equity Securities, FV-NI [Line Items]    
Fair Value 663 817
Other currencies    
Equity Securities, FV-NI [Line Items]    
Fair Value $ 41 $ 42