Restructuring (Schedule of Restructuring Activities and Related Liabilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring reserve balance, beginning of period	$ 10us-gaap_RestructuringReserve	$ 58us-gaap_RestructuringReserve
Restructuring charges (reversals), net	58	6
Cash payments	(23)us-gaap_PaymentsForRestructuring	(54)us-gaap_PaymentsForRestructuring
Non-cash charges (reversals), net	(6)
Restructuring reserve balance, end of period	39us-gaap_RestructuringReserve	10us-gaap_RestructuringReserve
Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring reserve balance, beginning of period	3	41
Restructuring charges (reversals), net	42	(5)
Cash payments	(19)	(33)
Non-cash charges (reversals), net	0
Restructuring reserve balance, end of period	26	3
Other Exit Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve balance, beginning of period	7	17
Restructuring charges (reversals), net	16	11
Cash payments	(4)	(21)
Non-cash charges (reversals), net	(6)
Restructuring reserve balance, end of period	$ 13	$ 7

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

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Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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

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-Subsection 3, 4

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Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost.

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

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-Topic 420

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