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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Q
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Q
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Q
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]            
Recorded investment $ 4,469   $ 4,469   $ 4,469 $ 4,799
Unpaid principal balance 4,972   4,972   4,972 5,300
Related specific allowance 1,084   1,084   1,084 1,345
Average carrying value         $ 4,632 4,577
Interest income recognized $ 72 $ 60 $ 143 $ 119    
Number of quarters used to calculate the average recorded investment balance | Q 4   4   4  
Residential first mortgages            
Financing Receivable, Impaired [Line Items]            
Recorded investment $ 1,606   $ 1,606   $ 1,606 1,787
Unpaid principal balance 1,768   1,768   1,768 1,962
Related specific allowance 122   122   122 157
Average carrying value         1,689 1,661
Interest income recognized 21 15 42 29    
Impaired financing receivable without specific allowance 202   202   202 211
Home equity loans            
Financing Receivable, Impaired [Line Items]            
Recorded investment 433   433   433 478
Unpaid principal balance 587   587   587 651
Related specific allowance 33   33   33 60
Average carrying value         468 527
Interest income recognized 3 4 6 7    
Impaired financing receivable without specific allowance 127   127   127 147
Credit cards            
Financing Receivable, Impaired [Line Items]            
Recorded investment 1,906   1,906   1,906 1,982
Unpaid principal balance 1,942   1,942   1,942 2,135
Related specific allowance 770   770   770 918
Average carrying value         1,951 1,926
Interest income recognized 33 25 68 51    
Personal, small business and other            
Financing Receivable, Impaired [Line Items]            
Recorded investment 524   524   524 552
Unpaid principal balance 675   675   675 552
Related specific allowance 159   159   159 210
Average carrying value         $ 524 $ 463
Interest income recognized $ 15 $ 16 $ 27 $ 32