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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 10,750,000 [1] 8,250,000
Creations (in Shares) 1,100,000 2,950,000
Redemptions (in Shares) (450,000) (450,000)
Closing balance (in Shares) 11,400,000 10,750,000 [1]
Opening balance $ 1,677,362,792 [1],[2] $ 1,157,505,203
Creations 184,909,847 466,052,755
Redemptions (72,954,024) (71,329,603)
Adjustment to redemption value 211,248,714 125,134,437
Closing balance $ 2,000,567,329 [2] $ 1,677,362,792 [1],[2]
Redemption value per Share at period end $ 175.49 $ 156.03
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.
[2] Authorized share capital is unlimited with no par value per share. Shares issued and outstanding at September 30, 2012 were 11,400,000 and at December 31, 2011 were 10,750,000.