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Goodwill, Purchased Technology and Other Intangible Assets (Schedule of Goodwill and Other Indefinite-lived Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 25, 2015
Oct. 26, 2014
Indefinite-lived intangible assets    
Goodwill $ 3,304us-gaap_Goodwill $ 3,304us-gaap_Goodwill
Other Intangible Assets 127us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 127us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total 3,431amat_IndefiniteLivedIntangibleAssetsGross 3,431amat_IndefiniteLivedIntangibleAssetsGross
Silicon Systems Group [Member]    
Indefinite-lived intangible assets    
Goodwill 2,151us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
2,151us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
Other Intangible Assets 103us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
103us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
Total 2,254amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
2,254amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_SiliconSystemsGroupMember
Applied Global Services [Member]    
Indefinite-lived intangible assets    
Goodwill 1,027us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
1,027us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
Other Intangible Assets 6us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
6us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
Total 1,033amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
1,033amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_AppliedGlobalServicesMember
Display [Member]    
Indefinite-lived intangible assets    
Goodwill 126us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember
126us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember
Other Intangible Assets 18us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember
18us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember
Total $ 144amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember
$ 144amat_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= amat_DisplayMember