Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Consumer Real Estate - Impaired Loans (Details)

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Outstanding Loans and Leases - Consumer Real Estate - Impaired Loans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 887,689   $ 887,689   $ 881,391
Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 1,900   1,900    
Nonperforming Financing Receivable | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 860   860    
Federal Housing Administration | Fully Insured Loans | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 803   $ 803    
Consumer Real Estate          
Financing Receivable, Impaired [Line Items]          
Minimum period for modified payments under trial modification     3 months    
Maximum period for modified payments under trial modification     4 months    
Real estate acquired through foreclosure 479   $ 479   630
Loans with formal foreclosure proceeding in process 5,900   5,900    
Consumer Real Estate | Residential Mortgage          
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
With no recorded allowance 15,956   15,956   19,710
With an allowance recorded 7,276   7,276   7,861
Total 23,232   23,232   27,571
Impaired Financing Receivable, Recorded Investment [Abstract]          
With no recorded allowance 12,793   12,793   15,605
With an allowance recorded 7,098   7,098   7,665
Total 19,891   19,891   23,270
Related Allowance 452   452   531
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
With no recorded allowance 13,202 $ 13,981 14,332 $ 15,181  
With an allowance recorded 7,398 10,621 7,563 11,482  
Total 20,600 24,602 21,895 26,663  
Impaired Financing Receivable, Interest Income, Accrual and Cash Basis Method [Abstract]          
With no recorded allowance 97 107 310 392  
With an allowance recorded 61 92 186 341  
Total 158 199 $ 496 733  
Consumer Real Estate | Home equity          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable     180 days    
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
With no recorded allowance 3,541   $ 3,541   3,540
With an allowance recorded 1,015   1,015   852
Total 4,556   4,556   4,392
Impaired Financing Receivable, Recorded Investment [Abstract]          
With no recorded allowance 1,766   1,766   1,630
With an allowance recorded 884   884   728
Total 2,650   2,650   2,358
Related Allowance 212   212   $ 196
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
With no recorded allowance 1,835 1,509 1,777 1,449  
With an allowance recorded 809 745 756 746  
Total 2,644 2,254 2,533 2,195  
Impaired Financing Receivable, Interest Income, Accrual and Cash Basis Method [Abstract]          
With no recorded allowance 23 23 68 65  
With an allowance recorded 6 6 18 19  
Total $ 29 $ 29 $ 86 $ 84