Quarterly report pursuant to Section 13 or 15(d)

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

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. $ (2) $ (6)
Portion of ALLL balance:    
ALLL balance, beginning of period 691 638
Loan charge-offs (73) (70)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 35 31
Provision for credit losses 66 68
Provision For (Reduction In Allowance) Loan and Lease Losses. 68 74
ALLL balance, end of period 721 673
AULC Balance, beginning of period 87 98
AULC Balance, end of period 85 92
ACL balance, end of period 806 765
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. (2) 2
Portion of ALLL balance:    
ALLL balance, beginning of period 482 451
Loan charge-offs (23) (24)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 20 18
Provision for credit losses 36 35
ALLL balance, end of period 515 480
AULC Balance, beginning of period 84 87
AULC Balance, end of period 82 89
ACL balance, end of period 597 569
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. 0 (8)
Portion of ALLL balance:    
ALLL balance, beginning of period 209 187
Loan charge-offs (50) (46)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 15 13
Provision for credit losses   39
Provision For (Reduction In Allowance) Loan and Lease Losses. 32  
ALLL balance, end of period 206 193
AULC Balance, beginning of period 3 11
AULC Balance, end of period 3 3
ACL balance, end of period $ 209 $ 196