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, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period $ 691 $ 638 $ 598
Loan charge-offs (268) (252) (227)
Recoveries of loans previously charged-off 123 93 118
Provision for loan and lease losses (226) (212) (169)
Allowance for loans sold or transferred to loans held for sale     (20)
ALLL balance end of period 772 691 638
AULC balance beginning of period 87 98 72
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (9) (11) (22)
AULC balance end of period 96 87 98
ACL balance end of period 868 778 736
Additions to Unfunded Loan Commitments and Letters of Credit Allowance     4
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period 482 451 399
Loan charge-offs (79) (72) (92)
Recoveries of loans previously charged-off 65 41 73
Provision for loan and lease losses (74) (62) (85)
Allowance for loans sold or transferred to loans held for sale     (14)
ALLL balance end of period 542 482 451
AULC balance beginning of period 84 87 64
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (10) 3 (19)
AULC balance end of period 94 84 87
ACL balance end of period 636 566 538
Additions to Unfunded Loan Commitments and Letters of Credit Allowance     4
Consumer      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period 209 187 199
Loan charge-offs (189) (180) (135)
Recoveries of loans previously charged-off 58 52 45
Provision for loan and lease losses (152) (150) (84)
Allowance for loans sold or transferred to loans held for sale     6
ALLL balance end of period 230 209 187
AULC balance beginning of period 3 11 8
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 1 8 (3)
AULC balance end of period 2 3 11
ACL balance end of period $ 232 $ 212 198
Additions to Unfunded Loan Commitments and Letters of Credit Allowance     $ 0