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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of portfolio segments | segment 2   2    
Purchased impaired loans $ 2,102 $ 2,557 $ 2,102 $ 2,557  
Total home equity and residential real estate loans [Member]          
Purchased impaired loans 2,100   2,100   $ 2,400
Government insured or guaranteed residential real estate mortgages 700   700   800
TDRs [Member]          
Recorded Investment - Subsequently defaulted TDRs 19 $ 49 44 $ 107  
Nonperforming [Member]          
Troubled debt restructurings (TDRs) 900   900   1,000
Performing, including Consumer Credit Card TDRs [Member]          
Troubled debt restructurings (TDRs) 1,000   1,000   1,100
Federal Reserve Bank [Member]          
Loans pledged as collateral for the ability to borrow 17,000   17,000   18,700
Federal Home Loan Bank [Member]          
Loans pledged as collateral for the ability to borrow $ 63,700   $ 63,700   $ 62,800