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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 02, 2019
Jan. 01, 2019
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance $ 1,252        
Cumulative effect of change in accounting principle       $ (331) $ 17
Provision charged to income 600 $ 85      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 2,171        
Allowance for loan and lease losses          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 1,252 1,242      
Cumulative effect of change in accounting principle     $ 453    
Allowance for loan and lease losses, beginning of period, adjusted     1,705    
Charge-offs (174) (138)      
Recoveries 37 49      
Net charge-offs (137) (89)      
Provision charged to income 603 92      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 2,171 1,245      
Reserve for unfunded lending commitments          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 44 91      
Cumulative effect of change in accounting principle     (2)    
Allowance for loan and lease losses, beginning of period, adjusted     42    
Provision for unfunded lending commitments (3) (7)      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 39 84      
Commercial | Allowance for loan and lease losses          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 674 690      
Cumulative effect of change in accounting principle     (176)    
Allowance for loan and lease losses, beginning of period, adjusted     498    
Charge-offs (47) (26)      
Recoveries 3 2      
Net charge-offs (44) (24)      
Provision charged to income 298 25      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 752 691      
Commercial | Reserve for unfunded lending commitments          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 44 91      
Cumulative effect of change in accounting principle     (3)    
Allowance for loan and lease losses, beginning of period, adjusted     41    
Provision for unfunded lending commitments (3) (7)      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 38 84      
Retail | Allowance for loan and lease losses          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 578 552      
Cumulative effect of change in accounting principle     629    
Allowance for loan and lease losses, beginning of period, adjusted     1,207    
Charge-offs (127) (112)      
Recoveries 34 47      
Net charge-offs (93) (65)      
Provision charged to income 305 67      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 1,419 554      
Retail | Reserve for unfunded lending commitments          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 0 0      
Cumulative effect of change in accounting principle     1    
Allowance for loan and lease losses, beginning of period, adjusted     $ 1    
Provision for unfunded lending commitments 0 0      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance $ 1 $ 0