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Fair Value Measurements - Summary of Level 3 Fair Value Measurements of Contingent Consideration (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
6 Months Ended
Jul. 04, 2015
Apr. 04, 2015
Jan. 03, 2015
Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 164 $ 27 $ 50
Spinal Modulation | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 160 0 0
Spinal Modulation | Probability Weighted Discounted Cash Flow      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 1.90%    
Probability of Payment 95.00%    
Spinal Modulation | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 117    
Spinal Modulation | Monte Carlo Simulation      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of Payment 25.00%    
Spinal Modulation | Monte Carlo Simulation | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 1.10%    
Spinal Modulation | Monte Carlo Simulation | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 17.00%    
Spinal Modulation | Monte Carlo Simulation | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 43    
Nanostim | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 4 $ 27 $ 50
Nanostim | Probability Weighted Discounted Cash Flow      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 5.00%    
Probability of Payment 10.00%    
Nanostim | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 4