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Employee benefit obligations - Sensitivity analysis (Details) - Ardagh Group S.A. - Defined benefit plan - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assumptions and sensitivities    
Estimate of contributions expected to be paid in next year € 30 € 37
Discount rates    
Assumptions and sensitivities    
Decrease in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to decrease in actuarial assumption € 180 € 243
Increase in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to increase in actuarial assumption € (192) € (242)
Rates of inflation    
Assumptions and sensitivities    
Decrease in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to decrease in actuarial assumption € (80) € (93)
Increase in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to increase in actuarial assumption € 76 € 93
Rates of increase in salaries    
Assumptions and sensitivities    
Decrease in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to decrease in actuarial assumption € (86) € (93)
Increase in actuarial assumption (as a percent) 0.50% 0.50%
Increase (decrease) in pension obligations due to increase in actuarial assumption € 81 € 92
Expected longevity    
Assumptions and sensitivities    
Increase (decrease) in pension obligations due to increase in actuarial assumption € 46 € 63
Increase in actuarial assumption (in years) 1 year 1 year