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Retirement benefits (Details 2)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assumed health care trend rates in next fiscal year and future years      
Fair value of plan assets, valuation difference amortized in two to five years (as a percent) 25.00%    
Pension benefits
     
Retirement benefits      
Actual asset allocation (as a percent) 100.00% 100.00%  
Asset category, Target      
Target (as a percent) 100.00%    
Benefit obligation      
Discount rate (as a percent) 5.09% 4.13% 5.19%
Rate of compensation increase (as a percent) 3.50% 3.50% 3.50%
Net periodic benefit cost (years ended)      
Discount rate (as a percent) 4.13% 5.19% 5.68%
Expected return on plan assets (as a percent) 7.75% 7.75% 8.00%
Rate of compensation increase (as a percent) 3.50% 3.50% 3.50%
Expected rate of return on plan assets for 2012 (as a percent) 7.75%    
Pension benefits | Equity securities
     
Retirement benefits      
Actual asset allocation (as a percent) 73.00% 69.00%  
Asset category, Target      
Target (as a percent) 70.00%    
Target minimum range (as a percent) 65.00% 65.00%  
Target maximum range (as a percent) 75.00% 75.00%  
Pension benefits | Fixed income securities
     
Retirement benefits      
Actual asset allocation (as a percent) 27.00% 31.00%  
Asset category, Target      
Target (as a percent) 30.00%    
Target minimum range (as a percent) 25.00% 25.00%  
Target maximum range (as a percent) 35.00% 35.00%  
Other benefits
     
Retirement benefits      
Actual asset allocation (as a percent) 100.00% 100.00%  
Asset category, Target      
Target (as a percent) 100.00%    
Benefit obligation      
Discount rate (as a percent) 5.03% 4.07% 4.90%
Net periodic benefit cost (years ended)      
Discount rate (as a percent) 4.07% 4.90% 5.60%
Expected return on plan assets (as a percent) 7.75% 7.75% 8.00%
Assumed health care trend rates in next fiscal year and future years      
Assumed health care trend rate for medical in next fiscal year (as a percent) 7.50% 8.00%  
Assumed health care trend rate for grading down in 2019 and thereafter (as a percent) 5.00% 5.00%  
Assumed health care trend rate for dental in next fiscal year (as a percent) 5.00% 5.00%  
Assumed health care trend rate for vision in next fiscal year (as a percent) 4.00% 4.00%  
Age threshold health care trend rates are adjusted 65 years    
Percentage by which medical trend for post-65 is higher than pre-65 for 2012 through 2014 4.00%    
Percentage by which medical trend for post-65 is higher than pre-65 for 2015 3.00%    
Other benefits | Equity securities
     
Retirement benefits      
Actual asset allocation (as a percent) 74.00% 70.00%  
Asset category, Target      
Target (as a percent) 70.00%    
Target minimum range (as a percent) 65.00% 65.00%  
Target maximum range (as a percent) 75.00% 75.00%  
Other benefits | Fixed income securities
     
Retirement benefits      
Actual asset allocation (as a percent) 26.00% 30.00%  
Asset category, Target      
Target (as a percent) 30.00%    
Target minimum range (as a percent) 25.00% 25.00%  
Target maximum range (as a percent) 35.00% 35.00%