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Fair Value Measurements (Details) (USD $)
In Billions, unless otherwise specified
Mar. 22, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt obligations, excluding capital leases, carrying amount $ 2.8
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 $ 3.1