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Shareholders' equity (Details 2)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Reserve of cash flow hedges [member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period € 183   € 189
Changes of the year 283   (45)
Reversal to Inventories Adjustments (7)    
Reclassification adjustments (468)   39
Reserve at end of the period (9)   183
Reserve of cash flow hedges [member] | Gross Reserve [Member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period 240   246
Changes of the year 399   (59)
Reversal to Inventories Adjustments (10)    
Reclassification adjustments (642)   53
Reserve at end of the period (13)   240
Reserve of cash flow hedges [member] | Deferred Tax Liabilities [Member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period (57)   (57)
Changes of the year (116)   14
Reversal to Inventories Adjustments 3    
Reclassification adjustments 174   (14)
Reserve at end of the period 4   (57)
Reserve of remeasurements of defined benefit plans [member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period 114   (112)
Changes of the year (17)   (4)
Foreign currency translation differences     2
Change in Scope of Consolidation 1    
Reserve at end of the period 130   114
Reserve of remeasurements of defined benefit plans [member] | Gross Reserve [Member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period (133)   (99)
Changes of the year (15)   (33)
Foreign currency translation differences 1   (1)
Change in Scope of Consolidation | $   $ 4  
Reserve at end of the period (143)   (133)
Reserve of remeasurements of defined benefit plans [member] | Deferred Tax Liabilities [Member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period 19   (13)
Changes of the year (2)   29
Foreign currency translation differences (1)   3
Change in Scope of Consolidation | $   $ (3)  
Reserve at end of the period 13   19
Reserve of gains and losses from investments in equity instruments [member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Reserve at beginning of the period 90   21
Changes of the year (24)   69
Reserve at end of the period 66   € 90
Investments valued at fair value [Member]      
Disclosure Of Classes Of Share Capital Explanatory [Line Items]      
Changes of the year 15    
Reserve at end of the period € 15