Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 22, 2020
Registrant Name	dei_EntityRegistrantName	iShares U.S. ETF Trust
Central Index Key	dei_EntityCentralIndexKey	0001524513
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Dec. 22, 2020
Document Effective Date	dei_DocumentEffectiveDate	Dec. 22, 2020
Prospectus Date	rr_ProspectusDate	Aug. 24, 2020
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A