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Fair Value Measurements - Schedule of Fair Value of Investment Assets (Details) - USD ($) $ in Millions | Jun. 26, 2015 | Dec. 26, 2014
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized cost basis of investments | $ 777 | $ 453
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 777 | 453
Certificates of Deposit and Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 670 | 250
Corporate Bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 71 | 141
Government Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 32 | 51
Auction Rate Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 4 | 11
Level 2 | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 773 | 442
Level 2 | Certificates of Deposit and Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 670 | 250
Level 2 | Corporate Bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 71 | 141
Level 2 | Government Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 32 | 51
Level 2 | Auction Rate Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 4 | 11
Level 3 | Certificates of Deposit and Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 | Corporate Bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 | Government Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 | Auction Rate Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | $ 4 | $ 11

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