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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
quarter
Financing receivable impaired    
Recorded investment $ 3,748 $ 4,868
Unpaid principal balance 4,009 5,369
Related specific allowance 813 1,381
Average carrying value 4,200 4,595
Interest income recognized 265 $ 251
Number of quarters used to calculate the average recorded investment balance | quarter   4
Residential first mortgages    
Financing receivable impaired    
Recorded investment 1,521 $ 1,858
Unpaid principal balance 1,595 2,033
Related specific allowance 87 157
Average carrying value 1,564 1,682
Interest income recognized 88 101
Recorded investment, impaired financing receivable without specific allowance 190 211
Home equity loans    
Financing receivable impaired    
Recorded investment 191 479
Unpaid principal balance 344 652
Related specific allowance   60
Related specific allowance (recovery) (1)  
Average carrying value 336 527
Interest income recognized 9 13
Recorded investment, impaired financing receivable without specific allowance 94 147
Credit cards    
Financing receivable impaired    
Recorded investment 1,582 1,982
Unpaid principal balance 1,609 2,135
Related specific allowance 594 918
Average carrying value 1,795 1,926
Interest income recognized 116 106
Personal, small business and other    
Financing receivable impaired    
Recorded investment 454 549
Unpaid principal balance 461 549
Related specific allowance 133 246
Average carrying value 505 460
Interest income recognized $ 52 $ 31