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Impairment/reversal of tangible and intangible assets (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | € (848) | € (1,067) | € (6,537)
Reversal of impairment loss recognised in profit or loss | 1,055 | 1,153 |
Impairment loss (reversal of impairment loss) recognised in profit or loss | 225 | 475 | € (6,534)
Tangible Asset Other Than Goodwill [Member] |  |  |
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | (848) | (1,067) |
Reversal of impairment loss recognised in profit or loss | 1,055 | 1,153 |
Intangible Asset Other Than Goodwill [Member] |  |  |
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | (14) |  |
Reversal of impairment loss recognised in profit or loss | € 32 | € 389 |

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