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Net reversal (impairment) of tangible and intangible assets (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  | € 862 | € 1,067
Reversal of impairment loss recognised in profit or loss |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss | 866 | € (225) | € (475)
Intangible Assets [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Intangible assets other than goodwill [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Reversal of impairment loss recognised in profit or loss |  |  |
Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Reversal of impairment loss recognised in profit or loss |  |  |

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