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Credit Card and Student Loan Securitization Activities (Narrative) (Details)
6 Months Ended
Jun. 30, 2013
Variable Interest Entities Disclosure [Abstract]  
Excess spread rate minimum 0.00%
Average excess spread rate calculation period, months 3 months
Excess of the total investors' interests 7.00%
Excess spread rate trigger 4.50%
Increasing funding requirements as excess spread levels decline below preset levels 0.00%