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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 10,050 $ 10,875 $ 10,393 $ 11,237
Loans and leases charged off (1,336) (1,362) (4,010) (4,022)
Recoveries of loans and leases previously charged off 404 462 1,171 1,280
Net charge-offs (932) (900) (2,839) (2,742)
Provision (benefit) for loan and lease losses 711 829 2,362 2,395
Other 0 (38) (16) (36)
Allowance for loan and lease losses, end of the period 9,734 10,693 9,734 10,693
Provision for unfunded lending commitments 716 834 2,377 2,395
Reserve for unfunded lending commitments, end of the period 10,526 11,455 10,526 11,455
Allowance for credit losses 10,526 11,455 10,526 11,455
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 787 757 777 762
Provision for unfunded lending commitments 5 5 15  
Reserve for unfunded lending commitments, end of the period 792 762 792 762
Allowance for credit losses 787 757 777 762
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (95) (73) (166) (161)
Provision (benefit) for loan and lease losses 53 12 28 56
Reserve for unfunded lending commitments, beginning of the period     289  
Reserve for unfunded lending commitments, end of the period 150   150  
Allowance for credit losses 150   289  
Financing receivable allowance sold 71 45 88 80
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 1,366 2,309 1,720 2,750
Loans and leases charged off (155) (231) (466) (633)
Recoveries of loans and leases previously charged off 163 230 440 520
Net charge-offs 8 (1) (26) (113)
Provision (benefit) for loan and lease losses (119) (204) (368) (445)
Other (2) 1 (2) 1
Allowance for loan and lease losses, end of the period 1,158 2,032 1,158 2,032
Reserve for unfunded lending commitments, end of the period 1,158 2,032 1,158 2,032
Allowance for credit losses 1,158 2,032 1,158 2,032
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0 0 0  
Reserve for unfunded lending commitments, end of the period 0 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 (95) (73) (166) (161)
Reserve for unfunded lending commitments, beginning of the period     289  
Reserve for unfunded lending commitments, end of the period 150   150  
Allowance for credit losses 150   289  
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,774 3,386 3,663 3,229
Loans and leases charged off (992) (919) (3,031) (2,819)
Recoveries of loans and leases previously charged off 208 189 621 623
Net charge-offs (784) (730) (2,410) (2,196)
Provision (benefit) for loan and lease losses 829 934 2,583 2,553
Other 3 (40) (14) (36)
Allowance for loan and lease losses, end of the period 3,822 3,550 3,822 3,550
Reserve for unfunded lending commitments, end of the period 3,822 3,550 3,822 3,550
Allowance for credit losses 3,822 3,550 3,822 3,550
Credit card and other consumer | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0 0 0  
Reserve for unfunded lending commitments, end of the period 0 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 0
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 4,910 5,180 5,010 5,258
Loans and leases charged off (189) (212) (513) (570)
Recoveries of loans and leases previously charged off 33 43 110 137
Net charge-offs (156) (169) (403) (433)
Provision (benefit) for loan and lease losses 1 99 147 287
Other (1) 1 0 (1)
Allowance for loan and lease losses, end of the period 4,754 5,111 4,754 5,111
Reserve for unfunded lending commitments, end of the period 5,546 5,873 5,546 5,873
Allowance for credit losses 5,546 5,873 5,546 5,873
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Reserve for unfunded lending commitments, beginning of the period 787 757 777 762
Provision for unfunded lending commitments 5 5 15  
Reserve for unfunded lending commitments, end of the period 792 762 792 762
Allowance for credit losses 787 757 777 762
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0