Statements of Changes in Shareholders’ Capital (Unaudited) (iShares S&P Commodity-Indexed Trust [Member], USD $)	9 Months Ended	12 Months Ended
Sep. 30, 2013	Dec. 31, 2012
iShares S&P Commodity-Indexed Trust [Member]
Shareholders’ Capital, Beginning of Period	$ 1,167,588,732	$ 1,313,291,939
Shareholders’ Capital, End of Period	1,273,974,811	1,167,588,732
Net Asset Value per Share, End of Period (in Dollars per share)	$ 32.38	$ 32.84
Contributions	263,677,995	60,395,586
Redemptions	(133,315,923)	(192,357,388)
Net investment loss	(5,895,483)	(8,768,838)
Net realized gain (loss) on short-term investments	5,912	(1,661)
Net realized loss on futures contracts	(7,724,677)	(14,329,369)
Net change in unrealized appreciation/depreciation on futures contracts	$ (10,361,745)	$ 9,358,463

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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