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Deferred tax liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Deferred Tax Liabilities [Abstract] |
Disclosure of detailed information about Deferred tax liabilities [text block] | Deferred tax liabilities were recognized net of the amounts of deferred tax assets that can be offset for €4,269 million (€4,286 million at December 31, 2016).
(€ million) |  | Deferred tax liabilities
Amount at December 31, 2016 |  |  | 6,667 |
Additions |  |  | 1,171 |
Deductions |  |  | (835 | )
Currency translation differences |  |  | (1,123 | )
Other changes |  |  | 20 |
Amount at December 31, 2017 |  |  | 5,900 |
Disclosure of detailed information about Deferred tax assets and liabilities [text block] | Deferred tax assets and liabilities consisted of the following:
(€ million) |  | December 31, 2017 |  | December 31, 2016
Deferred tax liabilities |  |  | 10,169 |  |  |  | 10,953 |
Deferred tax assets available for offset |  |  | (4,269 | ) |  |  | (4,286 | )
|  |  | 5,900 |  |  |  | 6,667 |
Deferred tax assets not available for offset |  |  | (4,078 | ) |  |  | (3,790 | )
Net deferred tax liabilities |  |  | 1,822 |  |  |  | 2,877 |
Disclosure of temporary difference, unused tax losses and unused tax credits [text block] | The most significant temporary differences giving rise to net deferred tax liabilities are disclosed below:
(€ million) |  | Carrying amount at December 31, 2017 |  | Carrying amount at December 31, 2016
Deferred tax liabilities |  |  |  |  |  |  |  |
Accelerated tax depreciation |  |  | 8,323 |  |  |  | 8,899 |
Difference between the fair value and the carrying amount of assets acquired |  |  | 1,106 |  |  |  | 1,269 |
Site restoration and abandonment (tangible assets) |  |  | 305 |  |  |  | 348 |
Application of the weighted average cost method in evaluation of inventories |  |  | 70 |  |  |  | 81 |
Other |  |  | 365 |  |  |  | 356 |
|  |  | 10,169 |  |  |  | 10,953 |
Deferred tax assets, gross |  |  |  |  |  |  |  |
Carry-forward tax losses |  |  | (5,240 | ) |  |  | (4,722 | )
Site restoration and abandonment (provisions for contingencies) |  |  | (2,747 | ) |  |  | (2,881 | )
Timing differences on depreciation and amortization |  |  | (2,164 | ) |  |  | (2,260 | )
Accruals for impairment losses and provisions for contingencies |  |  | (1,404 | ) |  |  | (1,413 | )
Impairment losses |  |  | (801 | ) |  |  | (906 | )
Over/Underlifting |  |  | (395 | ) |  |  | (270 | )
Employee benefits |  |  | (194 | ) |  |  | (163 | )
Unrealized intercompany profits |  |  | (130 | ) |  |  | (118 | )
Other |  |  | (534 | ) |  |  | (965 | )
|  |  | (13,609 | ) |  |  | (13,698 | )
Impairments of deferred tax assets |  |  | 5,262 |  |  |  | 5,622 |
Deferred tax assets, net |  |  | (8,347 | ) |  |  | (8,076 | )
Net deferred tax liabilities |  |  | 1,822 |  |  |  | 2,877 |
Disclosure of reconciliation of changes in deferred tax liability assets [text block] | The following table summarizes the changes in deferred tax liabilities and assets:
(€ million) |  | Deferred tax liabilities |  | Deferred tax assets, gross |  | Impairments of deferred tax assets |  | Deferred tax assets, net |  | Net deferred tax liabilities
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount at the beginning of the year |  |  | 10,953 |  |  |  | (13,698 | ) |  |  | 5,622 |  |  |  | (8,076 | ) |  |  | 2,877 |
Additions |  |  | 1,171 |  |  |  | (2,341 | ) |  |  | 212 |  |  |  | (2,129 | ) |  |  | (958 | )
Deductions |  |  | (835 | ) |  |  | 1,588 |  |  |  | (349 | ) |  |  | 1,239 |  |  |  | 404 |
Currency translation differences |  |  | (1,123 | ) |  |  | 862 |  |  |  | (202 | ) |  |  | 660 |  |  |  | (463 | )
Other changes |  |  | 3 |  |  |  | (20 | ) |  |  | (21 | ) |  |  | (41 | ) |  |  | (38 | )
Carrying amount at the end of the year |  |  | 10,169 |  |  |  | (13,609 | ) |  |  | 5,262 |  |  |  | (8,347 | ) |  |  | 1,822 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount at the beginning of the year |  |  | 10,780 |  |  |  | (12,307 | ) |  |  | 5,099 |  |  |  | (7,208 | ) |  |  | 3,572 |
Additions |  |  | 1,796 |  |  |  | (2,994 | ) |  |  | 667 |  |  |  | (2,327 | ) |  |  | (531 | )
Deductions |  |  | (1,486 | ) |  |  | 1,208 |  |  |  | (254 | ) |  |  | 954 |  |  |  | (532 | )
Currency translation differences |  |  | 229 |  |  |  | (185 | ) |  |  | 80 |  |  |  | (105 | ) |  |  | 124 |
Other changes |  |  | (366 | ) |  |  | 580 |  |  |  | 30 |  |  |  | 610 |  |  |  | 244 |
Carrying amount at the end of the year |  |  | 10,953 |  |  |  | (13,698 | ) |  |  | 5,622 |  |  |  | (8,076 | ) |  |  | 2,877 |

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