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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Number of portfolio segments | segment 2   2    
TDRs [Member]          
Recorded Investment - Subsequently defaulted TDRs $ 28 $ 24 $ 39 $ 38  
Nonperforming [Member]          
Troubled debt restructurings (TDRs) 900   900   $ 900
Performing, including Consumer Credit Card TDRs [Member]          
Troubled debt restructurings (TDRs) 900   900   1,000
Federal Reserve Bank [Member]          
Loans pledged as collateral for the ability to borrow 15,600   15,600   17,300
Federal Home Loan Bank [Member]          
Loans pledged as collateral for the ability to borrow $ 65,000   $ 65,000   $ 63,200