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Fair Value Measurements (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Fair Value Disclosures [Abstract]    
Fair value of long-term debt, including current maturities $ 545us-gaap_DebtInstrumentFairValue $ 15us-gaap_DebtInstrumentFairValue
Carrying amount of long-term debt $ 514us-gaap_LongTermDebt $ 14us-gaap_LongTermDebt