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Deferred tax assets (Tables)
 12 Months Ended
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