Quarterly report pursuant to Section 13 or 15(d)

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

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ALLOWANCE FOR CREDIT LOSSES ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Document Period End Date Mar. 31, 2020        
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Total ALLL balance $ 1,504 $ 764   $ 783 $ 772
Financing Receivable, Allowance for Credit Loss, Writeoff (136) (97)      
Allowance for Loan and Lease Loss, Recovery of Bad Debts 19 26      
Provision For (Reduction In Allowance) Loan and Lease Losses. 447 63      
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax (306)        
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (6) 4      
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (1)        
AULC Balance 99 100   104 96
Acl Balance End Of Period 1,603 864 $ 1,280    
Allowance for credit loss, change since adoption 323        
Total ALLL balance 1,504 764   783 772
ALLL [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     (391)    
AULC [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     (2)    
Consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Total ALLL balance 508 219   231 230
Financing Receivable, Allowance for Credit Loss, Writeoff (48) (52)      
Allowance for Loan and Lease Loss, Recovery of Bad Debts 14 14      
Provision For (Reduction In Allowance) Loan and Lease Losses. 100 27      
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (1) 0      
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0        
AULC Balance 41 2   2 2
Acl Balance End Of Period 549 221      
Total ALLL balance 508 219   231 230
Consumer | ALLL [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     211    
Consumer | AULC [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     40    
Commercial and industrial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Total ALLL balance 996 545   552 542
Financing Receivable, Allowance for Credit Loss, Writeoff (88) (45)      
Allowance for Loan and Lease Loss, Recovery of Bad Debts 5 12      
Provision For (Reduction In Allowance) Loan and Lease Losses. 347 36      
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (5) 4      
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (1)        
AULC Balance 58 98   102 94
Acl Balance End Of Period 1,054 643      
Total ALLL balance $ 996 $ 545   $ 552 $ 542
Commercial and industrial | ALLL [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     (180)    
Commercial and industrial | AULC [Domain]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax     $ 38