Quarterly report pursuant to Section 13 or 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
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
payment
Sep. 30, 2016
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of missing payments causing default | payment     3  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 118 $ 294 $ 566 $ 1,147
Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 16 51 62 230
Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 32 40 99 145
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 16 42 93 124
Trial modifications        
Financing Receivable, Modifications [Line Items]        
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 54 $ 161 $ 312 $ 648