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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of portfolio segments | segment 2   2    
Purchased impaired loans $ 2,211 $ 2,691 $ 2,211 $ 2,691  
Total home equity and residential real estate loans [Member]          
Purchased impaired loans 2,200   2,200   $ 2,400
Government insured or guaranteed residential real estate mortgages 700   700   800
TDRs [Member]          
Recorded Investment - Subsequently defaulted TDRs 24 $ 42 38 $ 68  
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 contingent borrowings 19,700   19,700   18,700
Federal Home Loan Bank [Member]          
Loans pledged as collateral for contingent borrowings $ 63,000   $ 63,000   $ 62,800