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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
quarter
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
quarter
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
quarter
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]            
Recorded investment $ 3,852   $ 3,852   $ 3,852 $ 4,799
Unpaid principal balance 4,410   4,410   4,410 5,300
Related specific allowance 891   891   891 1,345
Average carrying value         $ 4,464 4,577
Interest income recognized $ 63 $ 63 $ 206 $ 181    
Number of quarters used to calculate the average recorded investment balance | quarter 4   4   4  
Residential first mortgages            
Financing Receivable, Impaired [Line Items]            
Recorded investment $ 1,422   $ 1,422   $ 1,422 1,787
Unpaid principal balance 1,566   1,566   1,566 1,962
Related specific allowance 103   103   103 157
Average carrying value         1,632 1,661
Interest income recognized 23 16 65 44    
Impaired financing receivable without specific allowance 191   191   191 211
Home equity loans            
Financing Receivable, Impaired [Line Items]            
Recorded investment 262   262   262 478
Unpaid principal balance 355   355   355 651
Related specific allowance 4   4   4 60
Average carrying value         408 527
Interest income recognized 2 3 8 10    
Impaired financing receivable without specific allowance 119   119   119 147
Credit cards            
Financing Receivable, Impaired [Line Items]            
Recorded investment 1,701   1,701   1,701 1,982
Unpaid principal balance 1,702   1,702   1,702 2,135
Related specific allowance 661   661   661 918
Average carrying value         1,895 1,926
Interest income recognized 24 26 92 77    
Personal, small business and other            
Financing Receivable, Impaired [Line Items]            
Recorded investment 467   467   467 552
Unpaid principal balance 787   787   787 552
Related specific allowance 123   123   123 210
Average carrying value         $ 529 $ 463
Interest income recognized $ 14 $ 18 $ 41 $ 50