Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance beginning of period $ 772 $ 691 $ 638
Loan charge-offs (362) (268) (252)
Recoveries of loans previously charged-off 97 123 93
Provision for loan and lease losses (277) (226) (212)
Allowance for loans sold or transferred to loans held for sale (1)    
ALLL balance end of period 783 772 691
AULC balance beginning of period 96 87 98
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (10) (9) (11)
AULC balance end of period 104 96 87
ACL balance end of period 887 868 778
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (2)    
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance beginning of period 542 482 451
Loan charge-offs (165) (79) (72)
Recoveries of loans previously charged-off 40 65 41
Provision for loan and lease losses (135) (74) (62)
Allowance for loans sold or transferred to loans held for sale 0    
ALLL balance end of period 552 542 482
AULC balance beginning of period 94 84 87
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (10) (10) (3)
AULC balance end of period 102 94 84
ACL balance end of period 654 636 566
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (2)    
Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
ALLL balance beginning of period 230 209 187
Loan charge-offs (197) (189) (180)
Recoveries of loans previously charged-off 57 58 52
Provision for loan and lease losses (142) (152) (150)
Allowance for loans sold or transferred to loans held for sale (1)    
ALLL balance end of period 231 230 209
AULC balance beginning of period 2 3 11
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 0 (1) (8)
AULC balance end of period 2 2 3
ACL balance end of period 233 $ 232 $ 212
Additions to Unfunded Loan Commitments and Letters of Credit Allowance $ 0