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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
3 Months Ended
Apr. 02, 2016
Jan. 02, 2016
Jan. 03, 2015
Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 36 $ 151 $ 50
Spinal Modulation | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 6 122 0
Spinal Modulation | Monte Carlo Simulation      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Expected revenue volatility 25.00%    
Spinal Modulation | Monte Carlo Simulation | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 0.90%    
Spinal Modulation | Monte Carlo Simulation | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 16.00%    
Spinal Modulation | Monte Carlo Simulation | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 6    
Nanostim | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 2 2 50
Nanostim | Probability Weighted Discounted Cash Flow      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 5.00%    
Probability of Payments 10.00%    
Nanostim | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 2    
Thoratec | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 28 $ 27 $ 0
Thoratec | Probability Weighted Discounted Cash Flow      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount Rate 4.90%    
Thoratec | Probability Weighted Discounted Cash Flow | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of Payments 0.00%    
Thoratec | Probability Weighted Discounted Cash Flow | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of Payments 90.00%    
Thoratec | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Contingent Consideration Liabilities $ 28