Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, January 1 $ 11,237 $ 12,234    
Loans and leases charged off   (1,496)    
Loans and leases charged off including disposal group (1,310)      
Recoveries of loans and leases previously charged off 376 428    
Net charge-offs   (1,068)    
Net charge-offs, including disposal group (934)      
Provision for loan and lease losses 840 1,016    
Other 1 (8)    
Allowance for loan and lease losses, March 31     $ 11,111  
Less: Change in allowance included in assets of business held for sale 1      
Total allowance for loan and lease losses, March 31 11,112 12,069    
Provision for unfunded lending commitments 835 997    
Reserve for unfunded lending commitments, March 31 11,869 12,696    
Allowance for credit losses 11,869 12,696 11,869  
Allowance included in assets of business held for sale     242 $ 243
Net charge-offs included in assets of business held for sale 44      
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, January 1 762 646    
Provision for unfunded lending commitments (5) (19)    
Reserve for unfunded lending commitments, March 31 757 627    
Allowance for credit losses 762 646 757 762
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (33) (105)    
Provision for loan and lease losses 68 (77)    
Reserve for unfunded lending commitments, January 1 419      
Reserve for unfunded lending commitments, March 31 454      
Allowance for credit losses 419   454 419
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, January 1 2,750 3,914    
Loans and leases charged off (204) (378)    
Recoveries of loans and leases previously charged off 123 175    
Net charge-offs (81) (203)    
Provision for loan and lease losses (71) (150)    
Total allowance for loan and lease losses, March 31 2,565 3,456    
Reserve for unfunded lending commitments, March 31 2,565 3,456    
Allowance for credit losses 2,565 3,456 2,565  
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, January 1 0 0    
Provision for unfunded lending commitments 0 0    
Reserve for unfunded lending commitments, March 31 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 (33) (105)    
Reserve for unfunded lending commitments, January 1 419      
Reserve for unfunded lending commitments, March 31 454      
Allowance for credit losses 419   454 419
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, January 1 3,229 3,471    
Loans and leases charged off   (912)    
Loans and leases charged off including disposal group (946)      
Recoveries of loans and leases previously charged off 200 198    
Net charge-offs   (714)    
Net charge-offs, including disposal group (746)      
Provision for loan and lease losses 843 552    
Other 2 (7)    
Allowance for loan and lease losses, March 31     3,328  
Less: Change in allowance included in assets of business held for sale 1      
Total allowance for loan and lease losses, March 31 3,329 3,302    
Reserve for unfunded lending commitments, March 31 3,329 3,302    
Allowance for credit losses 3,329 3,302 3,329  
Allowance included in assets of business held for sale     242 243
Credit card and other consumer | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, January 1 0 0    
Provision for unfunded lending commitments 0 0    
Reserve for unfunded lending commitments, March 31 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    
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, January 1 5,258 4,849    
Loans and leases charged off (160) (206)    
Recoveries of loans and leases previously charged off 53 55    
Net charge-offs (107) (151)    
Provision for loan and lease losses 68 614    
Other (1) (1)    
Total allowance for loan and lease losses, March 31 5,218 5,311    
Reserve for unfunded lending commitments, March 31 5,975 5,938    
Allowance for credit losses 5,975 5,938 5,975  
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, January 1 762 646    
Provision for unfunded lending commitments (5) (19)    
Reserve for unfunded lending commitments, March 31 757 627    
Allowance for credit losses 762 646 $ 757 $ 762
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0