Quarterly report pursuant to Section 13 or 15(d)

Allowance for Credit Losses - Allowance and Carrying Value by Portfolio Segment (Details)

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Allowance for Credit Losses - Allowance and Carrying Value by Portfolio Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses $ 726   $ 818      
Carrying value $ 16,105   $ 19,220      
Allowance as a percentage of carrying value 4.51%   4.26%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 9,652   $ 10,243      
Carrying value $ 893,415   $ 875,854      
Allowance as a percentage of carrying value 1.08%   1.17%      
Purchased credit-impaired loans            
Valuation allowance $ 11,455     $ 12,459    
Valuation allowance as a percentage of carrying value 2.78%   3.05%      
Less: Assets of business held for sale            
Less: Allowance included in assets of business held for sale     $ (243)      
Carrying value     (9,214)      
Total            
Allowance for loan and lease losses $ 10,693 $ 10,875 11,237 11,692 $ 11,837 $ 12,234
Carrying value $ 920,832   $ 899,598      
Allowance as a percentage of carrying value 1.16%   1.25%      
Loans and leases $ 927,117   $ 906,683      
Estimate of Fair Value Measurement            
Total            
Loans and leases 6,285   7,085      
Small Business Commercial Loan | United States            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 27   27      
Purchased Credit-impaired            
Purchased credit-impaired loans            
Valuation allowance 315   419      
Carrying value gross of valuation allowance 11,312   13,738      
Total            
Loans and leases 11,312          
Consumer real estate            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 369   356      
Carrying value $ 13,122   $ 15,408      
Allowance as a percentage of carrying value 2.81%   2.31%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 1,348   $ 1,975      
Carrying value $ 234,764   $ 229,094      
Allowance as a percentage of carrying value 0.57%   0.86%      
Purchased credit-impaired loans            
Valuation allowance $ 2,032     2,989    
Valuation allowance as a percentage of carrying value 2.78%   3.05%      
Total            
Allowance for loan and lease losses $ 2,032 2,309 $ 2,750 2,989 3,209 3,914
Carrying value $ 259,198   $ 258,240      
Allowance as a percentage of carrying value 0.78%   1.06%      
Consumer real estate | Purchased Credit-impaired            
Purchased credit-impaired loans            
Valuation allowance $ 315   $ 419      
Carrying value gross of valuation allowance 11,312   13,738      
Credit card and other consumer            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 125   189      
Carrying value $ 485   $ 610      
Allowance as a percentage of carrying value 25.77%   30.98%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 3,425   $ 3,283      
Carrying value $ 187,932   $ 197,470      
Allowance as a percentage of carrying value 1.82%   1.66%      
Purchased credit-impaired loans            
Valuation allowance $ 3,550     3,390    
Less: Assets of business held for sale            
Less: Allowance included in assets of business held for sale     $ (243)      
Carrying value     (9,214)      
Total            
Allowance for loan and lease losses 3,550 3,386 3,229 3,390 3,334 3,471
Carrying value $ 188,417   $ 188,866      
Allowance as a percentage of carrying value 1.88%   1.71%      
Credit card and other consumer | Credit Card Receivable | United States            
Total            
Loans and leases $ 92,602   $ 92,278      
Credit card and other consumer | Credit Card Receivable | Non United States            
Total            
Related allowance, including loans held for sale     61      
Carrying value     182      
Commercial            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 232   273      
Carrying value $ 2,498   $ 3,202      
Allowance as a percentage of carrying value 9.29%   8.53%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 4,879   $ 4,985      
Carrying value $ 470,719   $ 449,290      
Allowance as a percentage of carrying value 1.04%   1.11%      
Purchased credit-impaired loans            
Valuation allowance $ 5,873     6,080    
Total            
Allowance for loan and lease losses 5,111 $ 5,180 $ 5,258 $ 5,313 $ 5,294 $ 4,849
Carrying value $ 473,217   $ 452,492      
Allowance as a percentage of carrying value 1.08%   1.16%      
Loans and leases $ 478,524   $ 458,526      
Commercial | Estimate of Fair Value Measurement            
Total            
Loans and leases 5,307   6,034      
Commercial | United States            
Total            
Loans and leases 282,677   270,372      
Commercial | Non United States            
Total            
Loans and leases $ 95,896   $ 89,397