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Income Taxes (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Percentage threshold that the positions taken or expected to be taken is more likely than not sustained upon examination by tax authorities (in hundredths)	50.00%
Amount of unrecognized tax benefits that may decrease in the next 12 months	$ 0
Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate	87	$ 89
Continuing Operations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 91	$ 98	$ 115

X

- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

Percentage Threshold That Positions Taken Or Expected To Be Taken Is More Likely Than Not Sustained Upon Examination

+ References

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- Definition

Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate

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