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SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Securities purchased under agreements to resell $ 220,276 $ 204,655
Deposits paid for securities borrowed 94,801 90,067
Total, net 315,077 294,722
Allowance for credit losses on securities purchased and borrowed (5) (10)
Total, net of allowance 315,072 294,712
Securities sold under agreements to repurchase 198,029 181,194
Deposits received for securities loaned 21,139 18,331
Total, net 219,168 199,525
Securities-for-securities lending transactions $ 2,700 $ 6,800