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Pensions and other post-employment benefits - Asset Ceiling and Other (Details)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
multiplier
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Pensions and Other Post-Employment Benefits      
Net defined benefit balance € (461) € (1,198)  
Pension curtailment expense (41) (7)  
Defined benefit plans and post-retirement benefits plans      
Pensions and Other Post-Employment Benefits      
Defined benefit asset net of asset ceiling limitation 25,036    
Past service cost 3 (2) € 5
United States      
Pensions and Other Post-Employment Benefits      
Section 420 Transfer Of Excess Pension Assets 160    
Net defined benefit balance 432 (230)  
United States Post-retirement benefits      
Pensions and Other Post-Employment Benefits      
Net defined benefit balance (1,986) (2,482)  
SVTP      
Pensions and Other Post-Employment Benefits      
Past service cost € 14    
Multiple of annual French social security pension limit | multiplier 8    
AUXAD      
Pensions and Other Post-Employment Benefits      
Past service cost € 12    
FRANCE      
Pensions and Other Post-Employment Benefits      
Past service cost (23)    
UNITED STATES      
Pensions and Other Post-Employment Benefits      
Past service cost (24)    
UNITED STATES | United States Post-retirement benefits      
Pensions and Other Post-Employment Benefits      
Section 420 Transfer Of Excess Pension Assets 1,265    
Defined benefit asset net of asset ceiling limitation (1,265)    
Increase in net defined benefit asset 451    
Net defined benefit balance 1,716    
Funded status      
Pensions and Other Post-Employment Benefits      
Net defined benefit balance 38 (893) € (389)
Past service cost (3) 2  
Funded status | United States Post-retirement benefits      
Pensions and Other Post-Employment Benefits      
Section 420 Transfer Of Excess Pension Assets 160 172  
Net defined benefit balance (1,986) € (2,482)  
Past service cost € 1