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Clearing Operations (Schedule of Clearing Member Default Fund Contributions) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
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| Clearing Operations [Line Items] | ||||
| Default fund contributions | $ 229 | |||
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Cash Contributions [Member]
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| Clearing Operations [Line Items] | ||||
| Default fund contributions | 191 | [1] | ||
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Non-Cash Contributions [Member]
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| Clearing Operations [Line Items] | ||||
| Default fund contributions | $ 38 | |||
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