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, 2017
USD ($)
payment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
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 $ 726 $ 1,440 $ 4,207
Modifications under government programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 81 262 457
Modifications under proprietary programs      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 138 196 287
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 116 158 285
Trial modifications      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 391 $ 824 $ 3,178