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Asset Quality (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Number of portfolio segments | segment 2    
Purchased impaired loans $ 2,396 $ 2,956 $ 3,522
Total home equity and residential real estate loans      
Purchased impaired loans 2,400 2,800  
Government insured or guaranteed residential real estate mortgages 800 800  
TDRs      
Recorded Investment - Subsequently defaulted TDRs 100 200 100
Associated Allowance for TDRs 230 271 $ 319
Nonperforming | TDRs      
Troubled debt restructurings (TDRs) 1,000 1,100  
Performing Financial Instruments      
Troubled debt restructurings (TDRs) 1,100 1,100  
Federal Reserve Bank      
Loans pledged as collateral for the ability to borrow 18,700 22,000  
Federal Home Loan Bank      
Loans pledged as collateral for the ability to borrow $ 62,800 $ 60,800