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DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Offsetting Derivative Liabilities [Abstract]    
Gross amounts of recognized liabilities $ 874 $ 1,033
Gross amounts offset in the condensed consolidated balance sheets (703) (917)
Derivatives 171 116
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments (17) (9)
Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received (173) (105)
Net amount $ (19) $ (2)