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Business Combinations (Allocation of the Assets Acquired and Liabilities Assumed) (Details) (USD $)
In Millions, unless otherwise specified
Oct. 26, 2014
Oct. 27, 2013
Nov. 10, 2011
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill $ 3,304us-gaap_Goodwill $ 3,294us-gaap_Goodwill  
Varian Semiconductor Equipment Associates Inc [Member]      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Fair value of net tangible assets acquired     892amat_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsOtherthanIntangibleAssetsandGoodwill
/ us-gaap_BusinessAcquisitionAxis
= amat_VarianSemiconductorEquipmentAssociatesIncMember
Goodwill     2,604us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= amat_VarianSemiconductorEquipmentAssociatesIncMember
Purchased intangible assets     1,365us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= amat_VarianSemiconductorEquipmentAssociatesIncMember
Purchase price allocated     $ 4,861us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= amat_VarianSemiconductorEquipmentAssociatesIncMember