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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Modifications [Line Items]        
Carrying value $ 514 $ 605 $ 946 $ 1,146
Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
Carrying value 313 405 581 785
Residential Mortgage | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 12 31 42 85
Residential Mortgage | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 34 30 64 63
Residential Mortgage | Trial modifications        
Financing Receivable, Modifications [Line Items]        
Carrying value 222 300 382 540
Residential Mortgage | Loans discharged in Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
Carrying value 45 44 93 97
Residential Mortgage | Contractual interest rate reduction | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 9 23 33 66
Residential Mortgage | Contractual interest rate reduction | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 19 14 39 32
Residential Mortgage | Capitalization of past due amounts | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 9 5 16 14
Residential Mortgage | Principal and/or interest forbearance | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 0 0 1 0
Residential Mortgage | Principal and/or interest forbearance | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 3 2 5 6
Residential Mortgage | Other modifications | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 3 8 8 19
Residential Mortgage | Other modifications | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 3 9 4 11
Home equity lines of credit        
Financing Receivable, Modifications [Line Items]        
Carrying value 201 200 365 361
Home equity lines of credit | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 3 16 7 25
Home equity lines of credit | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 14 20 82 67
Home equity lines of credit | Trial modifications        
Financing Receivable, Modifications [Line Items]        
Carrying value 165 145 240 230
Home equity lines of credit | Loans discharged in Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
Carrying value 19 19 36 39
Home equity lines of credit | Contractual interest rate reduction | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 2 12 5 18
Home equity lines of credit | Contractual interest rate reduction | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 1 2 33 28
Home equity lines of credit | Capitalization of past due amounts | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value   0 5 3
Home equity lines of credit | Principal and/or interest forbearance | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 1 4 2 6
Home equity lines of credit | Principal and/or interest forbearance | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 0 1 4 16
Home equity lines of credit | Other modifications | Modifications under government programs        
Financing Receivable, Modifications [Line Items]        
Carrying value 0 0 0 1
Home equity lines of credit | Other modifications | Modifications under proprietary programs        
Financing Receivable, Modifications [Line Items]        
Carrying value $ 13 $ 17 $ 40 $ 20