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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)

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