Annual report pursuant to Section 13 and 15(d)

Allowance for Credit Losses - Allowance by Portfolio Segment (Details)

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Allowance for Credit Losses - Allowance by Portfolio Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 11,237 $ 12,234 $ 14,419  
Loans and leases charged off (5,619) (5,448) (6,105)  
Recoveries of loans and leases previously charged off 1,640 1,627 1,767  
Net charge-offs (3,979) (3,821) (4,338)  
Provision for loan and lease losses 3,381 3,581 3,043  
Other (39) (174) (82)  
Allowance for loan and lease losses, December 31       $ 11,480
Less: Allowance included in assets of business held for sale (6)       (243)
Allowance for loan and lease losses, end of the period 10,393 11,237 12,234  
Reserve for unfunded lending commitments, beginning of the period 11,999 12,880    
Provision for unfunded lending commitments 3,396 3,597 3,161  
Reserve for unfunded lending commitments, end of the period 11,170 11,999 12,880  
Allowance for credit losses 11,999 12,880 12,880 11,999
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   100    
Reserve for unfunded lending commitments, beginning of the period 762 646 528  
Provision for unfunded lending commitments 15 16 118  
Reserve for unfunded lending commitments, end of the period 777 762 646  
Allowance for credit losses 762 646 528 762
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (207) (340) (808)  
Provision for loan and lease losses 76 (45) (40)  
Reserve for unfunded lending commitments, beginning of the period 419      
Reserve for unfunded lending commitments, end of the period 289 419    
Allowance for credit losses 419 419   419
Financing receivable allowance sold 87 60 234  
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 2,750 3,914 5,935  
Loans and leases charged off (770) (1,155) (1,841)  
Recoveries of loans and leases previously charged off 657 619 732  
Net charge-offs (113) (536) (1,109)  
Provision for loan and lease losses (710) (258) (70)  
Other 0 (30) (34)  
Allowance for loan and lease losses, end of the period 1,720 2,750 3,914  
Reserve for unfunded lending commitments, beginning of the period 2,750 3,914    
Reserve for unfunded lending commitments, end of the period 1,720 2,750 3,914  
Allowance for credit losses 2,750 3,914 3,914 2,750
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   0    
Reserve for unfunded lending commitments, beginning of the period 0 0 0  
Provision for unfunded lending commitments 0 0 0  
Reserve for unfunded lending commitments, end of the period 0 0 0  
Allowance for credit losses 0 0 0 0
Consumer Real Estate | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (207) (340) (808)  
Reserve for unfunded lending commitments, beginning of the period 419      
Reserve for unfunded lending commitments, end of the period 289 419    
Allowance for credit losses 419 419   419
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,229 3,471 4,047  
Loans and leases charged off (3,774) (3,553) (3,620)  
Recoveries of loans and leases previously charged off 809 770 813  
Net charge-offs (2,965) (2,783) (2,807)  
Provision for loan and lease losses 3,437 2,826 2,278  
Other (38) (42) (47)  
Allowance for loan and lease losses, December 31       3,472
Less: Allowance included in assets of business held for sale (6)       (243)
Allowance for loan and lease losses, end of the period 3,663 3,229 3,471  
Reserve for unfunded lending commitments, beginning of the period 3,229 3,471    
Reserve for unfunded lending commitments, end of the period 3,663 3,229 3,471  
Allowance for credit losses 3,229 3,471 3,471 3,229
Credit card and other consumer | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   0    
Reserve for unfunded lending commitments, beginning of the period 0 0 0  
Provision for unfunded lending commitments 0 0 0  
Reserve for unfunded lending commitments, end of the period 0 0 0  
Allowance for credit losses 0 0 0 0
Credit card and other consumer | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off 0 0 0  
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 5,258 4,849 4,437  
Loans and leases charged off (1,075) (740) (644)  
Recoveries of loans and leases previously charged off 174 238 222  
Net charge-offs (901) (502) (422)  
Provision for loan and lease losses 654 1,013 835  
Other (1) (102) (1)  
Allowance for loan and lease losses, end of the period 5,010 5,258 4,849  
Reserve for unfunded lending commitments, beginning of the period 6,020 5,495    
Reserve for unfunded lending commitments, end of the period 5,787 6,020 5,495  
Allowance for credit losses 6,020 5,495 5,495 6,020
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   100    
Reserve for unfunded lending commitments, beginning of the period 762 646 528  
Provision for unfunded lending commitments 15 16 118  
Reserve for unfunded lending commitments, end of the period 777 762 646  
Allowance for credit losses 762 646 528 $ 762
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0