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Borrowings (Schedule Of Short-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 24, 2015
Jul. 26, 2014
Short-term Debt [Line Items]    
Amount $ 855us-gaap_DebtCurrent $ 508us-gaap_DebtCurrent
Current portion of long-term debt    
Short-term Debt [Line Items]    
Amount 850us-gaap_DebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember		 500us-gaap_DebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective Rate 0.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember		 3.11%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember
Other short-term debt    
Short-term Debt [Line Items]    
Amount $ 5us-gaap_DebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember		 $ 8us-gaap_DebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Effective Rate 2.73%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember		 2.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember