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Provisions for employee benefits (Details 7) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | TFR [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € (13) € (15)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption (72) (57)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | FISDE and other foreign medical plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption (7) (7)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Other benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € (3) (2)
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | TFR [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 9 10
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 24 33
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | Other benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 1 1
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Salary Increases [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Salary Increases [Member] | Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 20 15
Top Of Range [Member] | Actuarial Assumption Of Medical Cost Trend Rates [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Top Of Range [Member] | Actuarial Assumption Of Medical Cost Trend Rates [Member] | FISDE and other foreign medical plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 7 8
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Pension Increases [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Pension Increases [Member] | Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 13 23
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member]    
Statement Line Items [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | TFR [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 14 16
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 79 66
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | FISDE and other foreign medical plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 7 8
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Other benefit plans [Member]    
Statement Line Items [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 1 € 2