Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 1,979 $ 4,005 $ 6,803
Carrying Value $ 1,666 $ 3,430 $ 5,712
Pre-Modification Interest Rate 4.40% 4.61% 5.12%
Post-Modification Interest Rate 3.54% 4.11% 4.73%
Net Charge-offs $ 72 $ 181 $ 171
Residential Mortgage      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 1,130 2,986 5,940
Carrying Value $ 1,017 $ 2,655 $ 5,120
Pre-Modification Interest Rate 4.73% 4.98% 5.28%
Post-Modification Interest Rate 4.16% 4.43% 4.93%
Net Charge-offs $ 11 $ 97 $ 72
Principal forgiveness 13 396 53
Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 849 1,019 863
Carrying Value $ 649 $ 775 $ 592
Pre-Modification Interest Rate 3.95% 3.54% 4.00%
Post-Modification Interest Rate 2.72% 3.17% 3.33%
Net Charge-offs $ 61 $ 84 $ 99