Quarterly report pursuant to Section 13 or 15(d)

Allowance for Credit Losses - Changes in Allowance by Portfolio Segment (Details)

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Allowance for Credit Losses - Changes in Allowance by Portfolio Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance $ 11,837 $ 13,068 $ 12,234 $ 14,419
Loans and leases charged off (1,277) (1,375) (4,151) (4,573)
Recoveries of loans and leases previously charged off 389 443 1,210 1,379
Net charge-offs (888) (932) (2,941) (3,194)
Provision for loan and lease losses 834 733 2,802 2,218
Other (8) (64) (133) (60)
Allowance for loan and lease losses, ending balance 11,692 12,657 11,692 12,657
Provision for unfunded lending commitments 850 806 2,823 2,351
Reserve for unfunded lending commitments, ending balance 12,459 13,318 12,459 13,318
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other 1   100  
Reserve for unfunded lending commitments, beginning balance 750 588 646 528
Provision for unfunded lending commitments 16 73 21 133
Reserve for unfunded lending commitments, ending balance 767 661 767 661
Purchased Credit - impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (83) (148) (270) (726)
Provision for loan and lease losses 8 (68) (81) (40)
Reserve for unfunded lending commitments, beginning balance     804  
Reserve for unfunded lending commitments, ending balance 453   453  
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance 3,209 4,741 3,914 5,935
Loans and leases charged off (246) (345) (928) (1,430)
Recoveries of loans and leases previously charged off 145 199 464 587
Net charge-offs (101) (146) (464) (843)
Provision for loan and lease losses (36) (12) (191) 68
Other 0 (35) 0 (34)
Allowance for loan and lease losses, ending balance 2,989 4,400 2,989 4,400
Reserve for unfunded lending commitments, ending balance 2,989 4,400 2,989 4,400
Consumer Real Estate | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other 0   0  
Reserve for unfunded lending commitments, beginning balance 0 0 0 0
Provision for unfunded lending commitments 0 0 0 0
Reserve for unfunded lending commitments, ending balance 0 0 0 0
Consumer Real Estate | Purchased Credit - impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (83) (148) (270) (726)
Reserve for unfunded lending commitments, beginning balance     804  
Reserve for unfunded lending commitments, ending balance 453   453  
Credit Card and Other Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance 3,334 3,702 3,471 4,047
Loans and leases charged off (868) (873) (2,664) (2,733)
Recoveries of loans and leases previously charged off 191 198 584 618
Net charge-offs (677) (675) (2,080) (2,115)
Provision for loan and lease losses 741 554 2,031 1,646
Other (8) (29) (32) (26)
Allowance for loan and lease losses, ending balance 3,390 3,552 3,390 3,552
Reserve for unfunded lending commitments, ending balance 3,390 3,552 3,390 3,552
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 balance 0 0 0 0
Provision for unfunded lending commitments 0 0 0 0
Reserve for unfunded lending commitments, ending balance 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 balance 5,294 4,625 4,849 4,437
Loans and leases charged off (163) (157) (559) (410)
Recoveries of loans and leases previously charged off 53 46 162 174
Net charge-offs (110) (111) (397) (236)
Provision for loan and lease losses 129 191 962 504
Other 0 0 (101) 0
Allowance for loan and lease losses, ending balance 5,313 4,705 5,313 4,705
Reserve for unfunded lending commitments, ending balance 6,080 5,366 6,080 5,366
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other 1   100  
Reserve for unfunded lending commitments, beginning balance 750 588 646 528
Provision for unfunded lending commitments 16 73 21 133
Reserve for unfunded lending commitments, ending balance 767 661 767 661
Commercial | Purchased Credit - impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0