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Employee Benefits (Details 2) - USD ($)
$ in Millions
12 Months Ended
Jan. 02, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net periodic cost        
Weighted-average healthcare cost rate   5.00%    
Effects created by one percentage point change in assumed healthcare cost trend        
Effect of 1% point increase on postretirement obligation   $ 5    
Effect of 1% point decrease on postretirement obligation   $ (4)    
Retirement Plans [Member]        
Benefit obligation        
Discount rate   4.15% 5.00% 4.10%
Net periodic cost        
Discount rate   5.00% 4.10% 5.10%
Compensation increase factor       4.50%
Return on assets   7.125% 7.25% 7.75%
Postretirement Plans [Member]        
Benefit obligation        
Discount rate   3.60% 4.20% 3.45%
Net periodic cost        
Weighted-average healthcare cost rate   7.00% 7.00% 7.50%
Discount rate   4.125% 3.45% 4.45%
United Kingdom Retirement Plan [Member]        
Net periodic cost        
Discount rate   4.50% 4.80% 5.10%
Compensation increase factor     5.75% 5.85%
Return on assets   6.75%    
United States Pension Plan of US Entity [Member]        
Net periodic cost        
Discount rate   5.00%    
Subsequent Event [Member] | Retirement Plans [Member]        
Net periodic cost        
Return on assets 6.25%      
Subsequent Event [Member] | United Kingdom Retirement Plan [Member]        
Net periodic cost        
Discount rate 3.80%      
Return on assets 6.25%      
Subsequent Event [Member] | United States Pension Plan of US Entity [Member]        
Net periodic cost        
Discount rate 4.15%