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Commitments and Contingencies - Environmental remediation (Details) - Environmental liabilities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Environmental Remediation      
Environmental reserves $ 70    
Estimated period over which accrued environmental remediation liabilities are likely to be paid 10 years    
Accrued environmental remediation liabilities classified as current liabilities $ 15    
Expenditures to evaluate and remediate contaminated sites 15 $ 15 $ 13
Minimum      
Environmental Remediation      
Potential environmental liabilities 40    
Maximum      
Environmental Remediation      
Potential environmental liabilities $ 150