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Warranty, Guarantees and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Apr. 26, 2015
Apr. 27, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 119us-gaap_StandardProductWarrantyAccrual $ 106us-gaap_StandardProductWarrantyAccrual $ 113us-gaap_StandardProductWarrantyAccrual $ 102us-gaap_StandardProductWarrantyAccrual
Provisions for warranty 31us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 29us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 67us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 56us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Consumption of reserves (27)us-gaap_StandardProductWarrantyAccrualPayments (26)us-gaap_StandardProductWarrantyAccrualPayments (57)us-gaap_StandardProductWarrantyAccrualPayments (49)us-gaap_StandardProductWarrantyAccrualPayments
Ending balance $ 123us-gaap_StandardProductWarrantyAccrual $ 109us-gaap_StandardProductWarrantyAccrual $ 123us-gaap_StandardProductWarrantyAccrual $ 109us-gaap_StandardProductWarrantyAccrual