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Fair Value Measurements - Schedule of Fair Value of Investment Assets (Details) - USD ($) $ in Millions | Sep. 25, 2015 | Dec. 26, 2014
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized cost basis of investments | $ 532 | $ 453
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 532 | 453
Certificates of Deposit and Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 425 | 250
Corporate Bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 70 | 141
Government Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 33 | 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 | 528 | 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 | 425 | 250
Level 2 | Corporate Bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 70 | 141
Level 2 | Government Securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value | 33 | 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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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