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Deferred tax assets and liabilities - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred tax assets and liabilities |  |  |
Carry-forward tax losses | € 23,325 |  |
Carry-forward tax losses indefinitely | 17,323 |  |
Deferred tax assets | € 7,166 | € 9,023 |
Tax rate | 24.00% | 24.00% | 24.00%
Accumulated impairment |  |  |
Deferred tax assets and liabilities |  |  |
Deferred tax assets | € (9,065) | € (6,744) |
Italy |  |  |
Deferred tax assets and liabilities |  |  |
Carry-forward tax losses | € 13,153 |  |
Tax rate | 24.00% |  |
Italy | Accumulated impairment |  |  |
Deferred tax assets and liabilities |  |  |
Deferred tax assets | € (7,090) |  |
Italy | Unused tax losses |  |  |
Deferred tax assets and liabilities |  |  |
Deferred tax assets | 3,734 |  |
Foreign (outside Italy) |  |  |
Deferred tax assets and liabilities |  |  |
Carry-forward tax losses | € 10,172 |  |
Tax rate | 31.90% |  |
Foreign (outside Italy) | Accumulated impairment |  |  |
Deferred tax assets and liabilities |  |  |
Deferred tax assets | € (1,975) |  |
Foreign (outside Italy) | Unused tax losses |  |  |
Deferred tax assets and liabilities |  |  |
Deferred tax assets | € 3,249 |  |

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- Definition The amount that represents the carry forward tax losses. + References No definition available. + Details
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- Definition The amount of carry-forward tax losses that can be used indefinitely. + References No definition available. + Details
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- Definition Schedule disclosing information related to details of deferred tax liabilities line items. + References No definition available. + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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