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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of portfolio segments | segment 2    
Purchased impaired loans $ 2,314 $ 2,811  
Total home equity and residential real estate loans [Member]      
Purchased impaired loans 2,300   $ 2,400
Government insured or guaranteed residential real estate mortgages 700   800
TDRs [Member]      
Recorded Investment - Subsequently defaulted TDRs 21 $ 32  
Nonperforming [Member]      
Troubled debt restructurings (TDRs) 900   1,000
Performing, including Consumer Credit Card TDRs [Member]      
Troubled debt restructurings (TDRs) 1,100   1,100
Federal Reserve Bank [Member]      
Loans pledged as collateral for contingent borrowings 19,100   18,700
Federal Home Loan Bank [Member]      
Loans pledged as collateral for contingent borrowings $ 64,600   $ 62,800