Accumulated Other Comprehensive Income (Loss) and Supplemental Equity Information (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 02, 2015	Jul. 04, 2015	Jul. 04, 2015	Jun. 28, 2014	Jan. 13, 2015	Jun. 07, 2013
Equity, Class of Treasury Stock [Line Items]
Authorized amount					$ 500,000,000
Shares repurchased, shares	7.5
Shares repurchased, value	$ 500,000,000		$ 500,000,000	$ 434,000,000
Average repurchase price (USD per share)	$ 66.96
Additions (purchases) of noncontrolling ownership interests			$ 330,000,000	$ 344,000,000
Spinal Modulation
Equity, Class of Treasury Stock [Line Items]
Equity investment						$ 40,000,000
Voting equity interest						19.00%
Additions (purchases) of noncontrolling ownership interests		$ 173,000,000
Ownership percentage by noncontrolling owners		81.00%	81.00%
Contingent consideration		$ 155,000,000	$ 155,000,000
Increase (decrease) in stockholders' equity		(297,000,000)
Increase (decrease) in noncontrolling interest		$ (33,000,000)