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Commitments, Contingencies and Guarantees (Schedule of Merchant Chargeback Guarantee) (Details) (Merchant Chargebacks [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | |||||
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Mar. 31, 2015
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Mar. 31, 2014
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Merchant Chargebacks [Member]
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| Loss Contingencies [Line Items] | ||||||
| Aggregate sales transaction volume | $ 29,498 | [1] | $ 28,154 | [1] | ||
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