Restructuring, Impairment and Integration Charges (Summary of Productivity Plan Activity) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Restructuring Reserve [Roll Forward]
Restructuring, Settlement and Impairment Provisions	$ 230	$ 418	$ 163
Cash payments for restructuring charges	(208)	(266)	(133)
2014 Productivity Plan
Restructuring Reserve [Roll Forward]
Liability at beginning of period	113	31
Restructuring, Settlement and Impairment Provisions	169	357	53
Cash payments for restructuring charges	(163)	(165)
Non-cash charges	(38)	(110)	(22)
Liability at end of period	81	113	31
2014 Productivity Plan \| Severance And Other Employee Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	89	30
Restructuring, Settlement and Impairment Provisions	59	148	52
Cash payments for restructuring charges	(76)	(56)
Non-cash charges	(11)	(33)	(22)
Liability at end of period	61	89	30
2014 Productivity Plan \| Asset Impairments
Restructuring Reserve [Roll Forward]
Liability at beginning of period	0	0
Restructuring, Settlement and Impairment Provisions	24	73	0
Cash payments for restructuring charges	0	0
Non-cash charges	(24)	(73)
Liability at end of period	0	0	0
2014 Productivity Plan \| Other Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	24	1
Restructuring, Settlement and Impairment Provisions	86	136	1
Cash payments for restructuring charges	(87)	(109)
Non-cash charges	(3)	(4)	0
Liability at end of period	20	24	1
Productivity Plan
Restructuring Reserve [Roll Forward]
Liability at beginning of period	33	85	127
Restructuring, Settlement and Impairment Provisions	61	61	110
Cash payments for restructuring charges	(45)	(101)	(133)
Non-cash charges	(11)	(12)	(19)
Liability at end of period	38	33	85
Productivity Plan \| Severance And Other Employee Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	28	68	91
Restructuring, Settlement and Impairment Provisions	39	31	74
Cash payments for restructuring charges	(24)	(65)	(89)
Non-cash charges	(8)	(6)	(8)
Liability at end of period	35	28	68
Productivity Plan \| Asset Impairments
Restructuring Reserve [Roll Forward]
Restructuring, Settlement and Impairment Provisions	4	6	6
Cash payments for restructuring charges	0	0
Non-cash charges	(4)	(6)	(6)
Productivity Plan \| Other Costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period	5	17	36
Restructuring, Settlement and Impairment Provisions	18	24	30
Cash payments for restructuring charges	(21)	(36)	(44)
Non-cash charges	1	0	(5)
Liability at end of period	3	5	$ 17
Other Productivity Initiatives [Member]
Restructuring Reserve [Roll Forward]
Cash payments for restructuring charges	(57)	(3)
Non-cash charges	(10)	$ (13)
Liability at end of period	$ 74

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)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

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))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

+ 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)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: 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)(2))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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- Definition

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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