XML 12 R4.htm IDEA: XBRL DOCUMENT v3.10.0.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AB FIXED INCOME SHARES INC
Prospectus Date rr_ProspectusDate Aug. 31, 2017
Document Creation Date dei_DocumentCreationDate Aug. 01, 2018