Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Nonrecurring Fair Value Measurements (Details)

v2.4.1.9
Fair Value Measurements Nonrecurring Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Unallocated Other Income [Member]    
Goodwill, Impaired [Abstract]    
Goodwill impairment charge $ 69us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= qcom_UnallocatedOtherIncomeMember
 
QMT [Member]    
Impaired Long-Lived Assets Held and Used [Line Items]    
Long-lived assets impairment charges   444us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= qcom_QmtMember
QRS [Member]    
Goodwill, Impaired [Abstract]    
Goodwill impairment charge   $ 16us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= qcom_QRSMember