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SECURITIES BORROWED, LOANED AND SUBJECT TO REPURCHASE AGREEMENTS - Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Securities purchased under agreements to resell $ 204,655 $ 169,874
Deposits paid for securities borrowed 90,067 81,448
Total, net 294,722 251,322
Allowance for credit losses on securities purchased and borrowed (10) 0
Total, net of allowance 294,712 251,322
Securities sold under agreements to repurchase 181,194 155,164
Deposits received for securities loaned 18,331 11,175
Total, net 199,525 166,339
Securities-for-securities lending transactions $ 6,800 $ 6,300