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LOANS AND LEASES - Components of Investments in Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Total future minimum lease rentals $ 1,381 $ 1,739
Estimated residual value of leased equipment (non-guaranteed) 746 1,013
Initial direct costs 7 10
Unearned income (166) (225)
Total leases $ 1,968 $ 2,537