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Shareholders’ equity (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period € 81 € (567)
Changes of the year (53) 248
Foreign currency translation differences 2 8
Reversal of the year 39 392
Reserve at end of the period 69 81
Gross Reserve [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period 152 (739)
Changes of the year (97) 373
Foreign currency translation differences (1) (4)
Reversal of the year 53 522
Reserve at end of the period 107 152
Deferred Tax Liabilities [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (71) 172
Changes of the year 44 (125)
Foreign currency translation differences 3 12
Reversal of the year (14) (130)
Reserve at end of the period (38) (71)
Reserve of cash flow hedges [member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period 189 (474)
Changes of the year (45) 270
Reversal of the year 39 393
Reserve at end of the period 183 189
Reserve of cash flow hedges [member] | Gross Reserve [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period 246 (637)
Changes of the year (59) 360
Reversal of the year 53 523
Reserve at end of the period 240 246
Reserve of cash flow hedges [member] | Deferred Tax Liabilities [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (57) 163
Changes of the year 14 (90)
Reversal of the year (14) (130)
Reserve at end of the period (57) (57)
Reserve of gains and losses on remeasuring available-for-sale financial assets [member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period 4 8
Changes of the year (4) (3)
Reversal of the year   (1)
Reserve at end of the period   4
Reserve of gains and losses on remeasuring available-for-sale financial assets [member] | Gross Reserve [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period 5 9
Changes of the year (5) (3)
Reversal of the year   (1)
Reserve at end of the period   5
Reserve of gains and losses on remeasuring available-for-sale financial assets [member] | Deferred Tax Liabilities [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (1) (1)
Changes of the year 1  
Reserve at end of the period   (1)
Reserve of remeasurements of defined benefit plans [member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (112) (101)
Changes of the year (4) (19)
Foreign currency translation differences 2 8
Reserve at end of the period (114) (112)
Reserve of remeasurements of defined benefit plans [member] | Gross Reserve [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (99) (111)
Changes of the year (33) 16
Foreign currency translation differences (1) (4)
Reserve at end of the period (133) (99)
Reserve of remeasurements of defined benefit plans [member] | Deferred Tax Liabilities [Member]    
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items]    
Reserve at beginning of the period (13) 10
Changes of the year 29 (35)
Foreign currency translation differences 3 12
Reserve at end of the period € 19 € (13)