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Provisions - Sensitivity of the Value of Termination, Post-Employment and Other Obligations (Details) - Discount rate
€ in Millions
Dec. 31, 2017
EUR (€)
Decrease in actuarial assumption  
Percent of possible decrease in actuarial assumption (1.00%)
Impact on value € (270)
Impact on income statement € (230)
Increase in actuarial assumption  
Percentage of possible increase in actuarial assumption 1.00%
Impact on value € 248
Impact on income statement € 213