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SECURITIES - Income Recognized from Investment Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Gains on sale of debt securities $ 3 $ 0
Losses on sale of debt securities 0 0
Debt securities gains, net $ 3 $ 0