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Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details)
$ in Millions
Jan. 01, 2016
USD ($)
Amortized Cost  
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis $ 377
AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortize 6
AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost 0
Total Amortized Cost 383
Fair Value  
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 377
Available-for-sale Securities, Debt Maturities, after One Through Five Years, at Fair Value 6
Available-for-sale Securities, Debt Maturities, after Five Years Fair Value 0
Total Fair Value $ 383