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Accumulated Other Comprehensive Income (Loss) and Supplemental Equity Information (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Feb. 19, 2016
Mar. 02, 2015
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Jan. 13, 2015
Business Acquisition [Line Items]            
Cash dividends declared per share (USD per share)     $ 1.16 $ 1.08 $ 1.00  
Amount paid to shareholders     $ 330,000,000 $ 344,000,000    
Stock repurchase program, authorized amount           $ 500,000,000
Number of shares repurchased   7.5        
Number of shares repurchased, value   $ 500,000,000 500,000,000 434,000,000 $ 808,000,000  
Average repurchase price (USD per share)   $ 66.96        
Spinal Modulation [Member]            
Business Acquisition [Line Items]            
Amount paid to shareholders     $ 173,000,000      
Ownership interests     81.00%      
Contingent consideration     $ 155,000,000      
Spinal Modulation [Member] | Parent Company [Member]            
Business Acquisition [Line Items]            
Decrease in shareholders' equity before noncontrolling interest     (297,000,000)      
Spinal Modulation [Member] | Noncontrolling Interest [Member]            
Business Acquisition [Line Items]            
Decrease in noncontrolling interest     $ (33,000,000)      
CardioMEMS, Inc [Member]            
Business Acquisition [Line Items]            
Amount paid to shareholders       $ 344,000,000    
Ownership interests       81.00%    
Pre-existing fee and compensation arrangements       $ 18,000,000    
CardioMEMS, Inc [Member] | Parent Company [Member]            
Business Acquisition [Line Items]            
Decrease in shareholders' equity before noncontrolling interest       (297,000,000)    
CardioMEMS, Inc [Member] | Noncontrolling Interest [Member]            
Business Acquisition [Line Items]            
Decrease in noncontrolling interest       $ (47,000,000)    
Subsequent Event [Member]            
Business Acquisition [Line Items]            
Cash dividends declared per share (USD per share) $ 0.31