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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 21, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt obligations, excluding capital leases, carrying amount $ 3,200us-gaap_LongTermDebt
Fair Value, Inputs, Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt obligations, excluding capital leases, estimate of fair value $ 3,500us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member