Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
ALLOWANCE FOR CREDIT LOSSES ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax $ (306)   $ (306)            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets 0   $ 0            
Document Period End Date     Jun. 30, 2020            
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Total ALLL balance 1,702 $ 774 $ 1,702 $ 774 $ 1,504   $ 783 $ 764 $ 772
Financing Receivable, Allowance for Credit Loss, Writeoff (123) (70) (259) (167)          
Allowance for Loan and Lease Loss, Recovery of Bad Debts 16 22 35 48          
Provision For (Reduction In Allowance) Loan and Lease Losses. 305 58 752 121          
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 22 1 16 5          
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (2)   (3)            
AULC Balance 119 101 119 101 99   104 100 96
Acl Balance End Of Period 1,821 875 1,821 875   $ 887      
Allowance for credit loss, change since adoption 934                
Total ALLL balance 1,702 774 1,702 774 1,504   783 764 772
ALLL [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax           (391)      
AULC [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
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 533 214 533 214 508   231 219 230
Financing Receivable, Allowance for Credit Loss, Writeoff (39) (46) (87) (97)          
Allowance for Loan and Lease Loss, Recovery of Bad Debts 12 16 26 29          
Provision For (Reduction In Allowance) Loan and Lease Losses. 52 25 152 52          
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (3) 0 36 0          
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0   0            
AULC Balance 38 2 38 2 41   2 2 2
Acl Balance End Of Period 571 216 571 216          
Total ALLL balance 533 214 533 214 508   231 219 230
Consumer | ALLL [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax           211      
Consumer | AULC [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax           0      
Commercial and industrial                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Total ALLL balance 1,169 560 1,169 560 996   552 545 542
Financing Receivable, Allowance for Credit Loss, Writeoff (84) (24) (172) (70)          
Allowance for Loan and Lease Loss, Recovery of Bad Debts 4 6 9 19          
Provision For (Reduction In Allowance) Loan and Lease Losses. 253 33 600 69          
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 25 1 (20) 5          
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (2)   (3)            
AULC Balance 81 99 81 99 58   102 98 94
Acl Balance End Of Period 1,250 659 1,250 659          
Total ALLL balance 1,169 $ 560 1,169 $ 560 $ 996   $ 552 $ 545 $ 542
Commercial and industrial | ALLL [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax           (180)      
Commercial and industrial | AULC [Domain]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax           (2)      
Cumulative Effect Period Of Adoption Adjustment Member [Member]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability           (393)      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Financing Receivable Allowance For Credit Loss Off Balance Sheet Credit Loss Liability           (2)      
Cumulative Effect Period Of Adoption Adjustment Member [Member] | Consumer                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability           (211)      
Cumulative Effect Period Of Adoption Adjustment Member [Member] | Commercial and industrial                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability           (180)      
Retained Earnings [Member]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ (306)   $ (306)            
Retained Earnings [Member] | Accounting Standards Update 2016-13 [Member]                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets           306      
Cumulative Effect Of New Accounting Principle In Period Of Adoption Deferred Taxes           $ 87