Statements of Financial Condition (Unaudited) (iShares S&P Commodity-Indexed Investing Pool LLC [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
iShares S&P Commodity-Indexed Investing Pool LLC [Member]
Current Assets
Cash and cash equivalents	$ 8,958,693	$ 204,654
Cash and cash equivalents held at brokers (restricted)	19,094,117	53,468,750
Short-term investments	1,204,426,274	0
Short-term investments held at brokers (restricted)	47,504,000	1,111,734,878
Receivable for variation margin on open futures contracts (Note 9)	0	2,942,400
Interest receivable	0	161
Total Assets	1,279,983,084	1,168,350,843
Current Liabilities
Payable for variation margin on open futures contracts (Note 9)	5,202,484	0
Management fees payable	789,407	745,492
Total Liabilities	5,991,891	745,492
Commitments and Contingent Liabilities (Note 7)
Members’ Equity
General member	16,382	16,619
Limited member	1,273,974,811	1,167,588,732
Total Members’ Equity	1,273,991,193	1,167,605,351
Total Liabilities and Members’ Equity	$ 1,279,983,084	$ 1,168,350,843