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Asset Quality (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Number of portfolio segments | segment 2   2    
TDRs [Member]          
Recorded Investment - Subsequently defaulted TDRs $ 42 $ 19 $ 68 $ 44  
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 16,200   16,200   17,300
Federal Home Loan Bank [Member]          
Loans pledged as collateral for the ability to borrow $ 66,700   $ 66,700   $ 63,200