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Deferred tax assets and liabilities (Details 2) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | € 7,956 | € 10,169 | € 10,953
Deferred tax assets, gross | 7,615 | 8,347 |
Accumulated write-downs of deferred tax assets | 5,741 | 5,262 |
Deferred tax assets, net | (7,615) | (8,347) |
Accelerated Tax Depreciation [Member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | 6,612 | 8,323 |
Difference between the fair value and the carrying amount of assets acquired [Member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | 849 | 1,106 |
Site restoration and abandonment (tangible assets) [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | 85 | 305 |
Application of the weighted average cost method in evaluation of inventories [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | 44 | 70 |
Other [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax liabilities | 366 | 365 |
Carry-forward tax losses [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (5,528) | (5,240) |
Site restoration and abandonment (provisions for contingencies) [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (1,986) | (2,747) |
Timing differences on depreciation and amortization [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (2,104) | (2,164) |
Accruals for impairment losses and provisions for contingencies [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (1,460) | (1,404) |
Impairment losses [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (792) | (801) |
Over/Under lifting [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (604) | (395) |
Employee benefits [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (212) | (194) |
Unrealized intercompany profits [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | (124) | (130) |
Other [member] |  |  |
Disclosure Of Deferred Taxes Liabilities [Line Items] |  |  |
Deferred tax assets, gross | € (546) | € (534) |

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