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Deferred tax assets and liabilities - Significant temporary differences (Details) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Temporary differences |  |
Deferred tax liabilities before offsetting | € 8,581 | € 9,583
Deferred tax assets | (7,166) | (9,023)
Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (16,231) | (15,767)
Accumulated impairment |  |
Temporary differences |  |
Deferred tax assets | 9,065 | 6,744
Accelerated tax depreciation |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 6,171 | 6,796
Leasing |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 1,089 | 1,375
Leasing | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (1,113) | (1,385)
Difference between the fair value and the carrying amount of assets acquired |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 415 | 617
Site restoration and abandonment (tangible assets) |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 199 | 126
Application of the weighted average cost method in evaluation of inventories |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 56 | 97
Other temporary differences |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 651 | 572
Other temporary differences | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (593) | (740)
Unused tax losses | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (6,983) | (6,065)
Site restoration and abandonment (provisions for contingencies) | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (2,211) | (2,242)
Timing differences on depreciation and amortization | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (2,206) | (2,022)
Accruals for impairment losses and provisions for contingencies | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (1,371) | (1,513)
Impairment losses | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (1,213) | (946)
Employee benefits | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (213) | (209)
Over/Under lifting | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (211) | (525)
Unrealized intercompany profits | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | € (117) | € (120)

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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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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [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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