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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period $ 11,112 $ 12,069 $ 11,237 $ 12,234
Loans and leases charged off (1,350) (1,378) (2,660) (2,874)
Recoveries of loans and leases previously charged off 442 393 818 821
Net charge-offs (908) (985) (1,842) (2,053)
Provision for loan and lease losses 726 952 1,566 1,968
Other 0 (117) 2 (125)
Allowance for loan and lease losses, end of the period 10,875 11,837 10,875 11,837
Provision for unfunded lending commitments 726 976 1,561 1,973
Reserve for unfunded lending commitments, end of the period 11,632 12,587 11,632 12,587
Allowance for credit losses 11,632 12,587 11,632 12,587
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   99   99
Reserve for unfunded lending commitments, beginning of the period 757 627 762 646
Provision for unfunded lending commitments 0 24 (5) 5
Reserve for unfunded lending commitments, end of the period 757 750 757 750
Allowance for credit losses 757 627 762 646
Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (55) (82) (88) (187)
Provision for loan and lease losses (24) (12) 44 (89)
Reserve for unfunded lending commitments, beginning of the period     419  
Reserve for unfunded lending commitments, end of the period 375   375  
Allowance for credit losses 375   419  
Financing receivable allowance sold 15 19 15 39
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 2,565 3,456 2,750 3,914
Loans and leases charged off (198) (304) (402) (682)
Recoveries of loans and leases previously charged off 167 144 290 319
Net charge-offs (31) (160) (112) (363)
Provision for loan and lease losses (170) (5) (241) (155)
Other 0 0 0 0
Allowance for loan and lease losses, end of the period 2,309 3,209 2,309 3,209
Reserve for unfunded lending commitments, end of the period 2,309 3,209 2,309 3,209
Allowance for credit losses 2,309 3,209 2,309 3,209
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 (55) (82) (88) (187)
Reserve for unfunded lending commitments, beginning of the period     419  
Reserve for unfunded lending commitments, end of the period 375   375  
Allowance for credit losses 375   419  
Credit card and other consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning of the period 3,329 3,302 3,229 3,471
Loans and leases charged off (954) (884) (1,900) (1,796)
Recoveries of loans and leases previously charged off 234 195 434 393
Net charge-offs (720) (689) (1,466) (1,403)
Provision for loan and lease losses 776 738 1,619 1,290
Other 1 (17) 4 (24)
Allowance for loan and lease losses, end of the period 3,386 3,334 3,386 3,334
Reserve for unfunded lending commitments, end of the period 3,386 3,334 3,386 3,334
Allowance for credit losses 3,386 3,334 3,386 3,334
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 5,218 5,311 5,258 4,849
Loans and leases charged off (198) (190) (358) (396)
Recoveries of loans and leases previously charged off 41 54 94 109
Net charge-offs (157) (136) (264) (287)
Provision for loan and lease losses 120 219 188 833
Other (1) (100) (2) (101)
Allowance for loan and lease losses, end of the period 5,180 5,294 5,180 5,294
Reserve for unfunded lending commitments, end of the period 5,937 6,044 5,937 6,044
Allowance for credit losses 5,937 6,044 5,937 6,044
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other   99   99
Reserve for unfunded lending commitments, beginning of the period 757 627 762 646
Provision for unfunded lending commitments 0 24 (5) 5
Reserve for unfunded lending commitments, end of the period 757 750 757 750
Allowance for credit losses 757 627 762 646
Commercial | Purchased Credit-impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0