Statements of Operations (Unaudited) (iShares S&P Commodity-Indexed Investing Pool LLC [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
iShares S&P Commodity-Indexed Investing Pool LLC [Member]
Investment Income
Interest	$ 94,498	$ 317,616	$ 497,302	$ 685,028
Total investment income	94,498	317,616	497,302	685,028
Expenses
Management fees	2,234,472	2,440,689	6,392,322	7,431,158
Brokerage commissions and fees	0	0	550	3,630
Total expenses	2,234,472	2,440,689	6,392,872	7,434,788
Net investment loss	(2,139,974)	(2,123,073)	(5,895,570)	(6,749,760)
Realized and Unrealized Gain (Loss)
Net realized gain (loss) on short-term investments	1,086	0	5,912	(1,604)
Net realized loss on futures contracts	(944,977)	(55,079)	(7,724,790)	(9,755,259)
Net change in unrealized appreciation/depreciation on futures contracts	45,996,006	136,071,359	(10,361,782)	48,687,049
Net realized and unrealized gain (loss)	45,052,115	136,016,280	(18,080,660)	38,930,186
Net gain (loss)	$ 42,912,141	$ 133,893,207	$ (23,976,230)	$ 32,180,426