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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
quarter
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
quarter
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 2,818   $ 2,818   $ 3,748
Unpaid principal balance 3,006   3,006   4,009
Related specific allowance 575   575   813
Average carrying value     3,117   4,200
Interest income recognized $ 43 $ 63 $ 159 $ 207  
Number of quarters used to calculate the average recorded investment balance | quarter 4   4    
Residential mortgages          
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 1,242   $ 1,242   1,521
Unpaid principal balance 1,361   1,361   1,595
Related specific allowance 49   49   87
Average carrying value     1,337   1,564
Interest income recognized 23 23 94 67  
Impaired financing receivable without specific allowance 144   144   190
Home equity loans          
Financing Receivable, Impaired [Line Items]          
Recorded investment 250   250   191
Unpaid principal balance 319   319   344
Related specific allowance (7)   (7)   (1)
Average carrying value     245   336
Interest income recognized 2 2 7 7  
Impaired financing receivable without specific allowance 75   75   94
Credit cards          
Financing Receivable, Impaired [Line Items]          
Recorded investment 1,212   1,212   1,582
Unpaid principal balance 1,212   1,212   1,609
Related specific allowance 461   461   594
Average carrying value     1,328   1,795
Interest income recognized 14 24 47 92  
Personal, small business and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 114   114   454
Unpaid principal balance 114   114   461
Related specific allowance 72   72   133
Average carrying value     207   $ 505
Interest income recognized $ 4 $ 14 $ 11 $ 41