Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases - Consumer Real Estate - TDRs Entering Payment Default That Were Modified During the Preceding 12 Months (Details)

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Outstanding Loans and Leases - Consumer Real Estate - TDRs Entering Payment Default That Were Modified During the Preceding 12 Months (Details) - Consumer real estate
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
payment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Residential Mortgage      
Financing Receivable, Modifications [Line Items]      
Number of missing payments causing default | payment 3    
Threshold period considered past due after modification 90 days    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 1,242 $ 3,950 $ 4,122
Residential Mortgage | Modifications under government programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 259 452 696
Residential Mortgage | Modifications under proprietary programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 133 263 714
Residential Mortgage | Loans discharged in Chapter 7 bankruptcy      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 136 238 481
Residential Mortgage | Trial modifications      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 714 2,997 2,231
Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 198 257 142
Home equity lines of credit | Modifications under government programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 3 5 4
Home equity lines of credit | Modifications under proprietary programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 63 24 12
Home equity lines of credit | Loans discharged in Chapter 7 bankruptcy      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 22 47 70
Home equity lines of credit | Trial modifications      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 110 $ 181 $ 56