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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 10,393 $ 11,237 $ 12,234  
Loans and leases charged off (5,402) (5,619) (5,448)  
Recoveries of loans and leases previously charged off 1,639 1,640 1,627  
Net charge-offs (3,763) (3,979) (3,821)  
Provision (benefit) for loan and lease losses 3,262 3,381 3,581  
Other (18) (39) (174)  
Total allowance for loan and lease losses, December 31       $ 11,480
Less: Allowance included in assets of business held for sale       (243)
Allowance for loan and lease losses, end of the period 9,601 10,393 11,237  
Reserve for unfunded lending commitments, beginning of the period 11,170 11,999    
Provision for unfunded lending commitments 3,282 3,396 3,597  
Reserve for unfunded lending commitments, end of the period 10,398 11,170 11,999  
Allowance for credit losses 10,398 11,170 11,999 11,999
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other     100  
Reserve for unfunded lending commitments, beginning of the period 777 762 646  
Provision for unfunded lending commitments 20 15 16  
Reserve for unfunded lending commitments, end of the period 797 777 762  
Allowance for credit losses 777 777 646 762
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (273) (207) (340)  
Reserve for unfunded lending commitments, beginning of the period 289      
Reserve for unfunded lending commitments, end of the period 91 289    
Allowance for credit losses 91 289    
Financing receivable allowance sold 167 87 60  
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 1,720 2,750 3,914  
Loans and leases charged off (690) (770) (1,155)  
Recoveries of loans and leases previously charged off 664 657 619  
Net charge-offs (26) (113) (536)  
Provision (benefit) for loan and lease losses (492) (710) (258)  
Other (1) 0 (30)  
Total allowance for loan and lease losses, December 31       2,750
Allowance for loan and lease losses, end of the period 928 1,720 2,750  
Reserve for unfunded lending commitments, beginning of the period 1,720 2,750    
Reserve for unfunded lending commitments, end of the period 928 1,720 2,750  
Allowance for credit losses 928 1,720 2,750 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 (273) (207) (340)  
Reserve for unfunded lending commitments, beginning of the period 289      
Reserve for unfunded lending commitments, end of the period 91 289    
Allowance for credit losses 91 289    
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,663 3,229 3,471  
Loans and leases charged off (4,037) (3,774) (3,553)  
Recoveries of loans and leases previously charged off 823 809 770  
Net charge-offs (3,214) (2,965) (2,783)  
Provision (benefit) for loan and lease losses 3,441 3,437 2,826  
Other (16) (38) (42)  
Total allowance for loan and lease losses, December 31       3,472
Less: Allowance included in assets of business held for sale       (243)
Allowance for loan and lease losses, end of the period 3,874 3,663 3,229  
Reserve for unfunded lending commitments, beginning of the period 3,663 3,229    
Reserve for unfunded lending commitments, end of the period 3,874 3,663 3,229  
Allowance for credit losses 3,874 3,663 3,229 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 5,010 5,258 4,849  
Loans and leases charged off (675) (1,075) (740)  
Recoveries of loans and leases previously charged off 152 174 238  
Net charge-offs (523) (901) (502)  
Provision (benefit) for loan and lease losses 313 654 1,013  
Other (1) (1) (102)  
Total allowance for loan and lease losses, December 31       5,258
Allowance for loan and lease losses, end of the period 4,799 5,010 5,258  
Reserve for unfunded lending commitments, beginning of the period 5,787 6,020    
Reserve for unfunded lending commitments, end of the period 5,596 5,787 6,020  
Allowance for credit losses 5,596 5,787 6,020 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 777 762 646  
Provision for unfunded lending commitments 20 15 16  
Reserve for unfunded lending commitments, end of the period 797 777 762  
Allowance for credit losses 777 777 762 $ 762
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0