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Fair Value Measurements (Carrying Value And Fair Value Of Long-Term Debt) (Details) (USD $) In Billions, unless otherwise specified	Feb. 22, 2015	May 25, 2014
Fair Value Disclosures [Abstract]
Carrying value of long-term debt	$ 1.48us-gaap_LongTermDebt	$ 2.50us-gaap_LongTermDebt
Fair value of long-term debt	$ 1.57us-gaap_DebtInstrumentFairValue	$ 2.63us-gaap_DebtInstrumentFairValue

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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