Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Shareholders’ equity $ (12,993) $ (11,795) $ (11,102)   $ (10,814)
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period 783 772 691    
Financing Receivable, Allowance for Credit Loss, Writeoff (540) (362) (268)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 91 97 123    
Provision For (Reduction In Allowance) Loan and Lease Losses. 1,089 277 226    
Allowance For Loans Sold Or Transferred To Loans Held For Sale   (1)      
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (41) 10 (9)    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (13)        
Additions to Unfunded Loan Commitments and Letters of Credit Allowance   (2)      
AULC Balance 52 104 96   87
Acl Balance End Of Period 1,866 887 868 $ 887  
Allowance for credit loss, change since adoption 979        
ALLL balance end of period 1,814 $ 783 772    
Provision increase related to COVID-10 pandemic and other 586        
Increase (decrease) in Net Charge-offs $ 184        
Increase (decrease) in Net Charge-offs, percent 69.00%        
Assumed Unemployment Rate   7.20%   3.75%  
Retained Earnings          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Shareholders’ equity $ (1,878) $ (2,088) (1,361)   (588)
ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period 391        
ALLL balance end of period   391      
ASU 2016-13 | Retained Earnings          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Shareholders’ equity       $ (306)  
Cumulative Effect Of New Accounting Principle In Period Of Adoption Deferred Taxes       87  
Commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period 552 542 482    
Financing Receivable, Allowance for Credit Loss, Writeoff (374) (165) (79)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 32 40 65    
Provision For (Reduction In Allowance) Loan and Lease Losses. 846 135 74    
Allowance For Loans Sold Or Transferred To Loans Held For Sale   0      
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (17) 10 (10)    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (13)        
Additions to Unfunded Loan Commitments and Letters of Credit Allowance   (2)      
AULC Balance 34 102 94   84
Acl Balance End Of Period 1,270 654 636    
ALLL balance end of period 1,236 552 542    
Commercial | ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period 180        
ALLL balance end of period   180      
Consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period 231 230 209    
Financing Receivable, Allowance for Credit Loss, Writeoff (166) (197) (189)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 59 57 58    
Provision For (Reduction In Allowance) Loan and Lease Losses. 243 142 152    
Allowance For Loans Sold Or Transferred To Loans Held For Sale   (1)      
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (24) 0 1    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0        
Additions to Unfunded Loan Commitments and Letters of Credit Allowance   0      
AULC Balance 18 2 2   3
Acl Balance End Of Period 596 233 232    
ALLL balance end of period 578 231 $ 230    
Consumer | ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
ALLL balance beginning of period $ 211        
ALLL balance end of period   211      
Cumulative Effect, Period of Adoption, Adjustment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability       (393)  
Shareholders’ equity   306     0
Financing Receivable Allowance For Credit Loss Off Balance Sheet Credit Loss Liability       (2)  
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Shareholders’ equity   306     $ (1)
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
AULC Balance   2      
Cumulative Effect, Period of Adoption, Adjustment | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability       (393)  
Cumulative Effect, Period of Adoption, Adjustment | Commercial | ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
AULC Balance   (38)      
Cumulative Effect, Period of Adoption, Adjustment | Consumer | ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
AULC Balance   $ 40      
Cumulative Effect Period Of Adoption Adjustment Member [Member] | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability       180  
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