Fund Investment Overview - Additional Information (Detail)	3 Months Ended
Mar. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Maximum remaining maturity of T-Bill ETFs	12 months

Maximum remaining maturity period of treasury bills for which indexes tracked to measure performance.

No definition available.

Name:	dbc_MaximumRemainingMaturityPeriodOfTreasuryBillsForWhichIndexesTrackedToMeasurePerformance
Namespace Prefix:	dbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration