Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Consumer Real Estate - TDRs Entered into During the Period (Details)

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Outstanding Loans and Leases - Consumer Real Estate - TDRs Entered into During the Period (Details) - Consumer real estate - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Financing Receivable, Modifications [Line Items]    
Unpaid Principal Balance $ 630 $ 757
Carrying Value $ 533 $ 669
Pre-Modification Interest Rate 4.77% 4.35%
Post-Modification Interest Rate 4.19% 4.24%
Net Charge-offs $ 8 $ 12
Residential Mortgage    
Financing Receivable, Modifications [Line Items]    
Unpaid Principal Balance 382 526
Carrying Value $ 344 $ 488
Pre-Modification Interest Rate 4.68% 4.72%
Post-Modification Interest Rate 4.44% 4.61%
Net Charge-offs $ 2 $ 2
Principal forgiveness 0 10
Home equity lines of credit    
Financing Receivable, Modifications [Line Items]    
Unpaid Principal Balance 248 231
Carrying Value $ 189 $ 181
Pre-Modification Interest Rate 4.90% 3.50%
Post-Modification Interest Rate 3.80% 3.39%
Net Charge-offs $ 6 $ 10