Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Consumer Real Estate - Modification Programs (Details)

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Outstanding Loans and Leases - Consumer Real Estate - Modification Programs (Details) - Consumer real estate - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Modifications [Line Items]        
Total modifications $ 389 $ 514 $ 839 $ 946
Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 17 15 35 49
Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 92 48 331 146
Trial modifications        
Financing Receivable, Modifications [Line Items]        
Total modifications 242 387 379 622
Loans discharged in Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
Total modifications 38 64 94 129
Contractual interest rate reduction | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 9 11 17 38
Contractual interest rate reduction | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 13 20 67 72
Capitalization of past due amounts | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 19 9 43 21
Principal and/or interest forbearance | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 0 1 0 3
Principal and/or interest forbearance | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 5 3 16 9
Other modifications | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 8 3 18 8
Other modifications | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Total modifications 55 $ 16 205 $ 44
Hurricane-Related Modifications | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Total modifications $ 38   $ 196