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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance $ 1,236    
Provision charged to income 326 $ 321 $ 369
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 1,242 1,236  
Allowance for loan and lease losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 1,236 1,236 1,216
Charge-offs (494) (512) (536)
Recoveries 177 207 201
Net charge-offs (317) (305) (335)
Provision charged to income 323 305 [1] 355
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 1,242 1,236 1,236
Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 88 72 58
Provision for unfunded lending commitments 3 16 14
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 91 88 72
Allowance for loan and lease losses and reserve for off-balance sheet activities, total      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 1,324 1,308  
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 1,333 1,324 1,308
Commercial | Allowance for loan and lease losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 685 663 596
Charge-offs (52) (75) (79)
Recoveries 19 40 33
Net charge-offs (33) (35) (46)
Provision charged to income 38 57 [1] 113
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 690 685 663
Commercial | Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 88 72 58
Provision for unfunded lending commitments 3 16 14
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 91 88 72
Commercial | Allowance for loan and lease losses and reserve for off-balance sheet activities, total      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 773 735  
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 781 773 735
Retail | Allowance for loan and lease losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 551 573 620
Charge-offs (442) (437) (457)
Recoveries 158 167 168
Net charge-offs (284) (270) (289)
Provision charged to income 285 248 [1] 242
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 552 551 573
Retail | Reserve for unfunded lending commitments      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 0 0 0
Provision for unfunded lending commitments 0 0 0
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance 0 0 0
Retail | Allowance for loan and lease losses and reserve for off-balance sheet activities, total      
Allowance for Loan and Lease Losses [Roll Forward]      
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance 551 573  
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance $ 552 551 $ 573
Scenario, Adjustment | Commercial | Allowance for loan and lease losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Provision charged to income   $ 50  
[1] Includes an increase of approximately $50 million to commercial and corresponding decrease to retail for the impact of the enhancement to the assessment of qualitative risks, factors and events that may not be measured in the modeled results.