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Deferred tax liabilities (Details 2) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | € 10,169 | € 10,953 | € 10,780
Deferred tax assets, gross | (13,609) | (13,698) | (12,307)
Impairments of deferred tax assets | 5,262 | 5,622 |
Deferred tax assets, net | (8,347) | (8,076) | (7,208)
Net deferred tax liabilities | 1,822 | 2,877 | € 3,572
Accelerated Tax Depreciation [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | 8,323 | 8,899 |
Difference Between The Fair Value And Carrying Amount of Assets Acquired [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | 1,106 | 1,269 |
Site Restoration And Abandonment Tangible Assets [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | 305 | 348 |
Application of the Weighted Average Cost Method in Evaluation of Inventories [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | 70 | 81 |
Other Deferred Tax Liabilities Gross [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities | 365 | 356 |
Carry Forward Tax Losses [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (5,240) | (4,722) |
Site Restoration And Abandonment Provisions For Contingencies [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (2,747) | (2,881) |
Timing Differences On Depreciation And Amortization [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (2,164) | (2,260) |
Accruals For Impairment Losses And Provisions For Contingencies [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (1,404) | (1,413) |
Impairment Losses [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (801) | (906) |
Over/Underlifting [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (395) | (270) |
Employee Benefits [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (194) | (163) |
Unrealized Intercompany Profits [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | (130) | (118) |
Other Deferred Tax Assets Gross [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets, gross | € (534) | € (965) |

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