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Fair Value (Additional Information) (Details) (USD $)	Jul. 26, 2014	Jul. 27, 2013
Fair Value Measurements [Line Items]
Carrying Value, Cost Method Investments	$ 269,000,000	$ 242,000,000
Senior notes, carrying value	20,901,000,000	16,201,000,000
Level 2
Fair Value Measurements [Line Items]
Senior notes, fair value	22,400,000,000	17,600,000,000
Senior notes, carrying value	20,900,000,000	16,200,000,000
Level 3
Fair Value Measurements [Line Items]
Long term loan receivables and financed service contracts and others carrying value	$ 2,100,000,000	$ 2,100,000,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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