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Business Events (Details Textuals) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Events (Details) [Abstract]          
CardMember loans transferred from HFS to held for investment $ 0        
CardMember receivables transferred from Held for Sales (HFS) to held for investment 0        
Business Events (Line Items)          
Gain on sale of held for sale (HFS) portfolio 0   $ 0 $ (1,218) $ 0
Other Expense [Member]          
Business Events (Line Items)          
Gain on sale of held for sale (HFS) portfolio $ 1,091 $ 127