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
Mar. 31, 2018
USD ($)
payment
Mar. 31, 2017
USD ($)
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 $ 112 $ 334
Modifications under government programs    
Financing Receivable, Modifications [Line Items]    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 13 26
Modifications under proprietary programs    
Financing Receivable, Modifications [Line Items]    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 31 34
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 23 62
Trial modifications    
Financing Receivable, Modifications [Line Items]    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 45 $ 212