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Asset Quality (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nonperforming loans $ 2,144,000,000 $ 2,126,000,000  
Total home equity and residential real estate loans [Member]      
Loans - Excluding purchased impaired loans 41,856,000,000 42,268,000,000  
Government insured or guaranteed residential real estate mortgages 800,000,000 900,000,000  
Home equity and residential real estate balances, excluding purchased impaired 2,800,000,000 3,400,000,000  
TDRs [Member]      
Associated Allowance for TDRs 271,000,000 319,000,000 $ 386,000,000
Recorded Investment - Subsequently defaulted TDRs 200,000,000 100,000,000 $ 200,000,000
Nonperforming [Member] | TDRs [Member]      
Troubled debt restructurings (TDRs) 1,100,000,000 1,100,000,000  
Performing, including Consumer Credit Card TDRs [Member] | TDRs [Member]      
Troubled debt restructurings (TDRs) 1,100,000,000 1,200,000,000  
Federal Reserve Bank [Member]      
Loans pledged as collateral for contingent borrowings 22,000,000,000 20,200,000,000  
Federal Home Loan Bank [Member]      
Loans pledged as collateral for contingent borrowings $ 60,800,000,000 $ 56,400,000,000