Fair Value Measurements - Unobservable Input Reconciliation of Contingent Consideration Liability (Details) - Fair Value, Inputs, Level 3 - Contingent Consideration Liabilities - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Apr. 02, 2016	Jan. 02, 2016
Contingent Consideration Liability [Roll Forward]
Beginning balance	$ 151	$ 50
Initial fair value measurement of contingent consideration		155
Liabilities assumed from Thoratec acquisition		33
Change in fair value of contingent consideration	9	(87)
Transfer out of Level 3 fair value measurement due to contractual settlement	(124)
Ending balance	36	151
Nanostim
Contingent Consideration Liability [Roll Forward]
Beginning balance	2	50
Initial fair value measurement of contingent consideration		0
Liabilities assumed from Thoratec acquisition		0
Change in fair value of contingent consideration	0	(48)
Transfer out of Level 3 fair value measurement due to contractual settlement	0
Ending balance	2	2
Spinal Modulation
Contingent Consideration Liability [Roll Forward]
Beginning balance	122	0
Initial fair value measurement of contingent consideration		155
Liabilities assumed from Thoratec acquisition		0
Change in fair value of contingent consideration	8	(33)
Transfer out of Level 3 fair value measurement due to contractual settlement	(124)
Ending balance	6	122
Thoratec
Contingent Consideration Liability [Roll Forward]
Beginning balance	27	0
Initial fair value measurement of contingent consideration		0
Liabilities assumed from Thoratec acquisition		33
Change in fair value of contingent consideration	1	(6)
Transfer out of Level 3 fair value measurement due to contractual settlement	0
Ending balance	$ 28	$ 27

Business Combination, Contingent Consideration Arrangements, Initial Fair Value Measurement

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

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 transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

The fair value of liabilities assumed in noncash investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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