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DERIVATIVES - Effect of Derivative Instruments on Net Income and Stockholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pre-tax net (losses) gains recognized in OCI $ (28) $ 129
Interest Income    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pretax net gains (losses) from OCI into income statement 46 5
Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pretax net gains (losses) from OCI into income statement $ (12) $ (1)