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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Q
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Q
Dec. 31, 2020
USD ($)
Financing receivable impaired        
Recorded investment $ 4,733   $ 4,733 $ 4,799
Unpaid principal balance 5,665   5,665 5,300
Related specific allowance 1,214   1,214 1,345
Average carrying value     $ 4,641 4,577
Interest income recognized $ 71 $ 58    
Number of quarters used to calculate the average recorded investment balance | Q 4   4  
Residential first mortgages        
Financing receivable impaired        
Recorded investment $ 1,708   $ 1,708 1,787
Unpaid principal balance 1,850   1,850 1,962
Related specific allowance 144   144 157
Average carrying value     1,695 1,661
Interest income recognized 21 14    
Impaired financing receivable without specific allowance 209   209 211
Home equity loans        
Financing receivable impaired        
Recorded investment 457   457 478
Unpaid principal balance 645   645 651
Related specific allowance 45   45 60
Average carrying value     498 527
Interest income recognized 3 3    
Impaired financing receivable without specific allowance 136   136 147
Credit cards        
Financing receivable impaired        
Recorded investment 1,992   1,992 1,982
Unpaid principal balance 2,593   2,593 2,135
Related specific allowance 844   844 918
Average carrying value     1,946 1,926
Interest income recognized 35 26    
Personal, small business and other        
Financing receivable impaired        
Recorded investment 576   576 552
Unpaid principal balance 577   577 552
Related specific allowance 181   181 210
Average carrying value     $ 502 $ 463
Interest income recognized $ 12 $ 15