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Credit Card and Student Loan Securitization Activities (Schedule of Investors' Interests and Related Excess Spreads) (Details) (Discover Card Execution Note Trust [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | |||
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Mar. 31, 2015
series
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Discover Card Execution Note Trust [Member]
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| Variable Interest Entity [Line Items] | ||||
| Investors' interests | $ 21,682 | [1] | ||
| Number of series outstanding (in series) | 39 | |||
| Three month rolling average excess spread (in percent) | 13.31% | |||
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