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Significant Credit Concentrations (Details 1) - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Card Member loans and receivables exposure    
On-balance sheet $ 170 $ 147
Individuals [Member]    
Card Member loans and receivables exposure    
On-balance sheet 112 98
Card Member Loans and Receivables [Member]    
Card Member loans and receivables exposure    
On-balance sheet 127 113
Unused lines-of-credit 273 242
U.S. [Member] | Card Member Loans and Receivables [Member]    
Card Member loans and receivables exposure    
On-balance sheet 102 93
Unused lines-of-credit 224 203
Non-U.S. [Member] | Card Member Loans and Receivables [Member]    
Card Member loans and receivables exposure    
On-balance sheet 25 20
Unused lines-of-credit $ 49 $ 39