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Costs (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Expenses [Line Items]      
Net provisions for contingencies € 1,120 € 886 € 505
Total Purchases Services And Other Costs 55,622 51,548 43,278
Purchase Services And Other [Member]      
Disclosure Of Operating Expenses [Line Items]      
Production costs - raw, ancillary and consumable materials and goods 41,125 35,907 27,783
Production costs - services 10,625 12,228 12,727
Operating leases and other 1,820 1,684 1,672
Net provisions for contingencies 1,120 886 505
Expenses for price variation on overliftling and underlifting operations   145 240
Other expenses 1,130 931 666
Purchase Services And Other Gross Of Capitalized Direct Costs Associated With Self Constructed Assets 55,820 51,781 43,593
capitalized direct costs associated with self-constructed assets - tangible assets (192) (224) (297)
capitalized direct costs associated with self-constructed assets - intangible assets (6) (9) (18)
Total Purchases Services And Other Costs € 55,622 € 51,548 € 43,278