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Postretirement benefit plans - Assumptions used (Details)
12 Months Ended
Dec. 31, 2013
U.S. defined benefit plan
 
Defined Benefit Plan Disclosure [Line Items]  
Equity securities (in percents) 35.00%
Fixed income securities and cash equivalents (in percents) 65.00%
U.S. retiree health care plan
 
Defined Benefit Plan Disclosure [Line Items]  
Equity securities (in percents) 50.00%
Fixed income securities and cash equivalents (in percents) 50.00%
Non-U.S. defined benefit plan
 
Defined Benefit Plan Disclosure [Line Items]  
Equity securities range minimum (in percents) 0.00%
Equity securities range maximum (in percents) 40.00%
Fixed income securities and cash equivalents range minimum (in percent) 60.00%
Fixed income securities and cash equivalents range maximum (in percents) 100.00%