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Fair Value Measurements - Schedule of Fair Value of Investment Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 27, 2015
Dec. 26, 2014
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized cost basis of investments $ 357us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 358us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 453us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Certificates of Deposit and Commercial Paper | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 250us-gaap_AvailableForSaleSecurities
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Corporate Bonds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 72us-gaap_AvailableForSaleSecurities
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Government Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 32us-gaap_AvailableForSaleSecurities
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Auction Rate Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 4us-gaap_AvailableForSaleSecurities
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Level 2 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 354us-gaap_AvailableForSaleSecurities
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Level 2 | Certificates of Deposit and Commercial Paper | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 250us-gaap_AvailableForSaleSecurities
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Level 2 | Corporate Bonds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 72us-gaap_AvailableForSaleSecurities
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Level 2 | Government Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 32us-gaap_AvailableForSaleSecurities
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Level 2 | Auction Rate Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 0us-gaap_AvailableForSaleSecurities
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Level 3 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 4us-gaap_AvailableForSaleSecurities
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Level 3 | Certificates of Deposit and Commercial Paper | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 0us-gaap_AvailableForSaleSecurities
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Level 3 | Corporate Bonds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 0us-gaap_AvailableForSaleSecurities
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Level 3 | Government Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value 0us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember
Level 3 | Auction Rate Securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments at fair value $ 4us-gaap_AvailableForSaleSecurities
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