Supplemental Balance Sheet Information (Details) (Inventories) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Raw materials	$ 40us-gaap_InventoryRawMaterials	$ 30us-gaap_InventoryRawMaterials
Work in process	431us-gaap_InventoryWorkInProcess	727us-gaap_InventoryWorkInProcess
Finished goods	214us-gaap_InventoryFinishedGoods	127us-gaap_InventoryFinishedGoods
Inventories, net	$ 685us-gaap_InventoryNet	$ 884us-gaap_InventoryNet

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Subparagraph (SX 210.5-02.6(a))

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

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-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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