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Deferred tax assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Deferred Taxes [Abstract] |
Disclosure of detailed information about Deferred tax assets [Text Block] | Deferred tax assets are stated net of amounts of deferred tax liabilities that can be offset for €4,269 million (€4,286 million at December 31, 2016).
(€ million) |  | Deferred tax assets |  | Provisions for impairments |  | Total
Amount at December 31, 2016 |  |  | 9,412 |  |  |  | (5,622 | ) |  |  | 3,790 |
Additions |  |  | 2,341 |  |  |  | (212 | ) |  |  | 2,129 |
Deductions |  |  | (1,588 | ) |  |  | 349 |  |  |  | (1,239 | )
Currency translation differences |  |  | (862 | ) |  |  | 202 |  |  |  | (660 | )
Other changes |  |  | 37 |  |  |  | 21 |  |  |  | 58 |
Amount at December 31, 2017 |  |  | 9,340 |  |  |  | (5,262 | ) |  |  | 4,078 |

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- Definition The disclosure of detailed information about deferred tax assets. + References No definition available. + Details
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