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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 10,875 $ 11,837 $ 11,237 $ 12,234
Loans and leases charged off (1,362) (1,277) (4,022) (4,151)
Recoveries of loans and leases previously charged off 462 389 1,280 1,210
Net charge-offs (900) (888) (2,742) (2,941)
Provision for loan and lease losses 829 834 2,395 2,802
Other (38) (8) (36) (133)
Allowance for loan and lease losses, end of the period 10,693 11,692 10,693 11,692
Provision for unfunded lending commitments 834 850 2,395 2,823
Reserve for unfunded lending commitments, end of the period 11,455 12,459 11,455 12,459
Allowance for credit losses 11,455 12,459 11,455 12,459
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   1   100
Reserve for unfunded lending commitments, beginning of the period 757 750 762 646
Provision for unfunded lending commitments 5 16 0 21
Reserve for unfunded lending commitments, end of the period 762 767 762 767
Allowance for credit losses 757 750 762 646
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (73) (83) (161) (270)
Provision for loan and lease losses 12 8 56 (81)
Reserve for unfunded lending commitments, beginning of the period     419  
Reserve for unfunded lending commitments, end of the period 315   315  
Allowance for credit losses 315   419  
Financing receivable allowance sold 45 11 80 50
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 2,309 3,209 2,750 3,914
Loans and leases charged off (231) (246) (633) (928)
Recoveries of loans and leases previously charged off 230 145 520 464
Net charge-offs (1) (101) (113) (464)
Provision for loan and lease losses (204) (36) (445) (191)
Other 1 0 1 0
Allowance for loan and lease losses, end of the period 2,032 2,989 2,032 2,989
Reserve for unfunded lending commitments, end of the period 2,032 2,989 2,032 2,989
Allowance for credit losses 2,032 2,989 2,032 2,989
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   0   0
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0 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 (73) (83) (161) (270)
Reserve for unfunded lending commitments, beginning of the period     419  
Reserve for unfunded lending commitments, end of the period 315   315  
Allowance for credit losses 315   419  
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,386 3,334 3,229 3,471
Loans and leases charged off (919) (868) (2,819) (2,664)
Recoveries of loans and leases previously charged off 189 191 623 584
Net charge-offs (730) (677) (2,196) (2,080)
Provision for loan and lease losses 934 741 2,553 2,031
Other (40) (8) (36) (32)
Allowance for loan and lease losses, end of the period 3,550 3,390 3,550 3,390
Reserve for unfunded lending commitments, end of the period 3,550 3,390 3,550 3,390
Allowance for credit losses 3,550 3,390 3,550 3,390
Credit card and other consumer | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   0   0
Reserve for unfunded lending commitments, beginning of the period 0 0 0 0
Provision for unfunded lending commitments 0 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 5,180 5,294 5,258 4,849
Loans and leases charged off (212) (163) (570) (559)
Recoveries of loans and leases previously charged off 43 53 137 162
Net charge-offs (169) (110) (433) (397)
Provision for loan and lease losses 99 129 287 962
Other 1 0 (1) (101)
Allowance for loan and lease losses, end of the period 5,111 5,313 5,111 5,313
Reserve for unfunded lending commitments, end of the period 5,873 6,080 5,873 6,080
Allowance for credit losses 5,873 6,080 5,873 6,080
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   1   100
Reserve for unfunded lending commitments, beginning of the period 757 750 762 646
Provision for unfunded lending commitments 5 16 0 21
Reserve for unfunded lending commitments, end of the period 762 767 762 767
Allowance for credit losses 757 750 762 646
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0