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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance $ 12,069 $ 13,676 $ 12,234 $ 14,419
Loans and leases charged off (1,378) (1,553) (2,874) (3,198)
Recoveries of loans and leases previously charged off 393 485 821 936
Net charge-offs (985) (1,068) (2,053) (2,262)
Provision for loan and lease losses 952 729 1,968 1,485
Other (117) 21 (125) 4
Allowance for loan and lease losses, ending balance 11,837 13,068 11,837 13,068
Provision for unfunded lending commitments 976 780 1,973 1,545
Reserve for unfunded lending commitments, ending balance 12,587 13,656 12,587 13,656
Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other 99   99  
Reserve for unfunded lending commitments, beginning balance 627 537 646 528
Provision for unfunded lending commitments 24 51 5 60
Reserve for unfunded lending commitments, ending balance 750 588 750 588
Purchased Credit - impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off (82) (290) (187) (578)
Provision for loan and lease losses (12) 78 (89) 28
Reserve for unfunded lending commitments, beginning balance     804  
Reserve for unfunded lending commitments, ending balance 528   528  
Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance 3,456 5,250 3,914 5,935
Loans and leases charged off (304) (533) (682) (1,085)
Recoveries of loans and leases previously charged off 144 205 319 388
Net charge-offs (160) (328) (363) (697)
Provision for loan and lease losses (5) 108 (155) 80
Other 0 1   1
Allowance for loan and lease losses, ending balance 3,209 4,741 3,209 4,741
Reserve for unfunded lending commitments, ending balance 3,209 4,741 3,209 4,741
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 (82) (290) (187) (578)
Reserve for unfunded lending commitments, beginning balance     804  
Reserve for unfunded lending commitments, ending balance 528   528  
Credit Card and Other Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Allowance for loan and lease losses, beginning balance 3,302 3,929 3,471 4,047
Loans and leases charged off (884) (896) (1,796) (1,860)
Recoveries of loans and leases previously charged off 195 204 393 420
Net charge-offs (689) (692) (1,403) (1,440)
Provision for loan and lease losses 738 445 1,290 1,092
Other (17) 20 (24) 3
Allowance for loan and lease losses, ending balance 3,334 3,702 3,334 3,702
Reserve for unfunded lending commitments, ending balance 3,334 3,702 3,334 3,702
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 5,311 4,497 4,849 4,437
Loans and leases charged off (190) (124) (396) (253)
Recoveries of loans and leases previously charged off 54 76 109 128
Net charge-offs (136) (48) (287) (125)
Provision for loan and lease losses 219 176 833 313
Other (100) 0 (101) 0
Allowance for loan and lease losses, ending balance 5,294 4,625 5,294 4,625
Reserve for unfunded lending commitments, ending balance 6,044 5,213 6,044 5,213
Commercial | Unfunded loan commitments        
Allowance for Loan and Lease Losses [Roll Forward]        
Other 99   99  
Reserve for unfunded lending commitments, beginning balance 627 537 646 528
Provision for unfunded lending commitments 24 51 5 60
Reserve for unfunded lending commitments, ending balance 750 588 750 588
Commercial | Purchased Credit - impaired        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans and leases charged off $ 0 $ 0 $ 0 $ 0