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Deferred tax assets and liabilities - Significant temporary differences (Details) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Temporary differences |  |
Deferred tax liabilities before offsetting | € 9,583 | € 7,956
Deferred tax assets | (9,023) | (7,615)
Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (15,767) | (13,356)
Accumulated impairment |  |
Temporary differences |  |
Deferred tax assets | 6,744 | 5,741
Accelerated tax depreciation |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 6,796 | 6,612
Leasing |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 1,375 |
Leasing | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (1,385) |
Difference between the fair value and the carrying amount of assets acquired |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 617 | 849
Site restoration and abandonment (tangible assets) |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 126 | 85
Application of the weighted average cost method in evaluation of inventories |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 97 | 44
Other temporary differences |  |
Temporary differences |  |
Deferred tax liabilities before offsetting | 572 | 366
Other temporary differences | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (740) | (546)
Unused tax losses | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (6,065) | (5,528)
Site restoration and abandonment (provisions for contingencies) | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (2,242) | (1,986)
Timing differences on depreciation and amortization | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (2,022) | (2,104)
Accruals for impairment losses and provisions for contingencies | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (1,513) | (1,460)
Impairment losses | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (946) | (792)
Over/Under lifting | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (525) | (604)
Employee benefits | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | (209) | (212)
Unrealized intercompany profits | Deferred tax assets, gross |  |
Temporary differences |  |
Deferred tax assets | € (120) | € (124)

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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