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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Number of portfolio segments | segment 2   2    
Purchased impaired loans $ 2,557 $ 3,080 $ 2,557 $ 3,080  
Total home equity and residential real estate loans [Member]          
Loans - Excluding purchased impaired and government insured or guaranteed loans 42,169   42,169   $ 41,856
Purchased impaired loans 2,500   2,500   2,800
Government insured or guaranteed residential real estate mortgages 700   700   800
TDRs [Member]          
Recorded Investment - Subsequently defaulted TDRs 49 $ 66 107 $ 118  
Nonperforming [Member]          
Troubled debt restructurings (TDRs) 1,000   1,000   1,100
Performing, including Consumer Credit Card TDRs [Member]          
Troubled debt restructurings (TDRs) 1,100   1,100   1,100
Federal Reserve Bank [Member]          
Loans pledged as collateral for contingent borrowings 19,900   19,900   22,000
Federal Home Loan Bank [Member]          
Loans pledged as collateral for contingent borrowings $ 62,700   $ 62,700   $ 60,800