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Summary of Significant Accounting Policies (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Significant Accounting Policies [Line Items]
Percentage of interest bearing deposits	100.00%
Interest earned on the Trust's average daily balances on deposit, percentage	100.00%
Interest rate under deposit denominated with foreign currencies	1.00%
Wells Fargo [Member]
Significant Accounting Policies [Line Items]
Trust assets owned	25.1
Maximum [Member]
Significant Accounting Policies [Line Items]
Ongoing offering costs as percentage of month-end net assets, to be paid and expensed as incurred	0.50%

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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