Quarterly report pursuant to Section 13 or 15(d)

ALLOWANCE FOR CREDIT LOSSES - Allowance Roll-forward (Details)

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ALLOWANCE FOR CREDIT LOSSES - Allowance Roll-forward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance, beginning of period $ 2,030 $ 1,814  
Loan and lease charge-offs (81) (95)  
Recoveries of loans and leases previously charged-off 62 31  
Provision for credit losses 7 (47)  
ALLL balance, end of period 2,018 1,703  
AULC balance, beginning of period 77 52  
Provision (reduction in allowance) for unfunded loan commitments 14 (13)  
Unfunded lending commitment losses   (1)  
AULC balance, end of period 91 38  
ACL balance, end of period 2,109 1,741 $ 2,100
Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance, beginning of period 1,462 1,236  
Loan and lease charge-offs (31) (61)  
Recoveries of loans and leases previously charged-off 40 12  
Provision for credit losses 43 10  
ALLL balance, end of period 1,514 1,197  
AULC balance, beginning of period 41 34  
Provision (reduction in allowance) for unfunded loan commitments 16 (6)  
Unfunded lending commitment losses   (1)  
AULC balance, end of period 57 27  
ACL balance, end of period 1,571 1,224  
Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance, beginning of period 568 578  
Loan and lease charge-offs (50) (34)  
Recoveries of loans and leases previously charged-off 22 19  
Provision for credit losses (36) (57)  
ALLL balance, end of period 504 506  
AULC balance, beginning of period 36 18  
Provision (reduction in allowance) for unfunded loan commitments (2) (7)  
Unfunded lending commitment losses   0  
AULC balance, end of period 34 11  
ACL balance, end of period $ 538 $ 517