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Provisions for employee benefits (Details 8)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
yr
Dec. 31, 2016
EUR (€)
yr
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 1,022 € 868
TFR [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 284 298
TFR [Member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 16 13
TFR [Member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 17 14
TFR [Member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 18 15
TFR [Member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 17 17
TFR [Member] | Later Than Three Years And Not Later Than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 14 19
TFR [Member] | Later than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 202 € 220
TFR [Member] | Weighted average duration [Member]    
Statement Line Items [Line Items]    
Weighted average duration of defined benefit obligation | yr 10.1 10.3
Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 409 € 276
Foreign defined benefit plans [Member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 47 31
Foreign defined benefit plans [Member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 65 44
Foreign defined benefit plans [Member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 70 33
Foreign defined benefit plans [Member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 79 33
Foreign defined benefit plans [Member] | Later Than Three Years And Not Later Than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 84 38
Foreign defined benefit plans [Member] | Later than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 64 € 97
Foreign defined benefit plans [Member] | Weighted average duration [Member]    
Statement Line Items [Line Items]    
Weighted average duration of defined benefit obligation | yr 17.5 17.9
FISDE and other foreign medical plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 122 € 124
FISDE and other foreign medical plans [Member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 5 5
FISDE and other foreign medical plans [Member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 5 5
FISDE and other foreign medical plans [Member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 5 5
FISDE and other foreign medical plans [Member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 5 5
FISDE and other foreign medical plans [Member] | Later Than Three Years And Not Later Than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 5 5
FISDE and other foreign medical plans [Member] | Later than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 97 € 99
FISDE and other foreign medical plans [Member] | Weighted average duration [Member]    
Statement Line Items [Line Items]    
Weighted average duration of defined benefit obligation | yr 13.7 13.9
Other benefit plans [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 207 € 170
Other benefit plans [Member] | Not later than one year [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 66 37
Other benefit plans [Member] | Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 60 59
Other benefit plans [Member] | Later than two years and not later than three years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 46 52
Other benefit plans [Member] | Later than three years and not later than four years [member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 8 3
Other benefit plans [Member] | Later Than Three Years And Not Later Than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) 6 3
Other benefit plans [Member] | Later than Five Years [Member]    
Statement Line Items [Line Items]    
Net defined benefit liability (asset) € 31 € 42
Other benefit plans [Member] | Weighted average duration [Member]    
Statement Line Items [Line Items]    
Weighted average duration of defined benefit obligation | yr 3.0 3.4