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Asset Quality (Credit Card and Other Consumer Loan Classes Asset Quality Indicators) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 222,855 [1] $ 220,458 [1] $ 218,034
% of Loans 100.00% 100.00%  
Credit Card [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 5,830 $ 5,699  
Credit Card [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 5,830 $ 5,699  
% of Loans 100.00% 100.00%  
Weighted average updated FICO score 734 735  
Credit Card [Member] | FICO Score - Greater than 719 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 3,522 $ 3,457  
% of Loans 61.00% 61.00%  
Credit Card [Member] | FICO Score - 650 to 719 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 1,633 $ 1,596  
% of Loans 28.00% 28.00%  
Credit Card [Member] | FICO Score - 620 to 649 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 253 $ 250  
% of Loans 4.00% 4.00%  
Credit Card [Member] | FICO Score - Less than 620 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 279 $ 272  
% of Loans 5.00% 5.00%  
Credit Card [Member] | No FICO Score Available Or Required [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 143 $ 124  
% of Loans 2.00% 2.00%  
Other Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 22,365 $ 21,744  
Other Consumer [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 17,398 $ 16,406  
% of Loans 100.00% 100.00%  
Weighted average updated FICO score 736 741  
Other Consumer [Member] | FICO Score - Greater than 719 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 10,427 $ 10,366  
% of Loans 60.00% 63.00%  
Other Consumer [Member] | FICO Score - 650 to 719 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 4,828 $ 4,352  
% of Loans 28.00% 27.00%  
Other Consumer [Member] | FICO Score - 620 to 649 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 913 $ 659  
% of Loans 5.00% 4.00%  
Other Consumer [Member] | FICO Score - Less than 620 [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 906 $ 715  
% of Loans 5.00% 4.00%  
Other Consumer [Member] | No FICO Score Available Or Required [Member] | Using FICO Credit Metric [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 324 $ 314  
% of Loans 2.00% 2.00%  
Other Consumer [Member] | Other Internal Credit Metrics [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 4,967 $ 5,338  
[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.2 billion, Loans of $.8 billion and Other assets of $.2 billion at June 30, 2018 and Loans held for sale of $1.7 billion, Loans of $.9 billion and Other assets of $.3 billion at December 31, 2017.